@volatile. With due respect: PAF bosses have said 250+ JF-17
http://www.dawn.com/news/1315117/16-new-jf-17-thunder-jets-added-to-paf-14-squadron
Now to your points.
1. Time of the 4th Gen fighter is nearing end: That is partially true and partially untrue. The role of the 4.5++ fighter is still very relevant. The USAF is planning on continuing legacy F-15s/F-18s/F-16s until 2050. That is a good 30+ more years. The spear tip of most modern airforces will change to the 5th gen to be sure, and I am not at all advocating that the 4.5Gen will be prime, but they will form the back bone of most airforces for the forseeable future. If that was not the case, the US would be phasing them out, which is not the case. Rather we have continued to upgrade them and are considering putting our F-16 fleet the SLEP and upgrading them with SABR AESA to F-16V. As for 4th gen fighters only serving as bomb trucks, it has been shown that modern 4th Gen fighters may soon be able to take on 5th gen fighters on better (though not equal) footing using passive targeting methods like IRST and EOTS. China's EOTS has been stated to be able to track B-2 Spirit from 150km away and F-22A from 110km away. So even in the A2A theater, they will be relevant even against the most advanced fighters (5th gen)
Regarding SELP:
http://www.defensenews.com/story/de...in-looks-upgrade-500--service-f-16s/87021372/
Regarding AESA for USAF:
https://insidedefense.com/daily-news/air-force-pursuing-limited-competition-f-16-aesa-radar-upgrade
USAF spending $12billion to upgrade F-15s which will be COMPLETED BY 2030 (meaning they expect over 500 F-15 to serve well beyond this timeframe).
https://defence.pk/threads/advanced...fter-service-entry.477706/page-7#post-9211737
In addition to the USAF/USN which are unarguably the most powerful and wealthy air forces in the world, RAF, RuAF, Armée de l'air, Luftwaffe, PLAAF, IDFAF, IAF all are planning to utilize 4 and 4.5 gen for many more years with some (RuAF, PLAAF, IAF and Armée de l'air will continue to add 4.5Gen fighters as may some of the others).
2. As for F-7PG and Mirage (even the ROSE I) being part of a strong airforce, that is just not true. They are no longer relevant in the modern air warfare, especially not in the Indo-Pak theater with is rapidly advancing. They also will not be airworthy much longer and should (as planned) be replaced by the JF-17.
3.
You have to look each and every type for replacements ,Now for your query related to next gen fighter ,PAF bosses have clarifies this many time and avionic city is enroute with fruitful results in 10-11 years by the time most of the F16 will be nearing retiring as well as 2007 inductees 1st block will be having last life .
JF17 is good platform because we have learn so many things with it and its our own baby we can do whatever we can do but real question remains how much relevancy 4++ Gen will be in 2025/2030 ? other than bomb truck for 5th Gen .
The avionic city may contribute to the next gen fighters of PAF, but that doesnt mean that Pakistan will be able to design its own fighter from start to finish. Firstly, Pakistan has no known capabilities of designing an aircraft, has no history of designing airborne radars, has no history of designing turbofan engines. That is not to say it wont be able to do so in the future, but that in order to do so in the time frame you suggesting, the city should have been in operation and working at many years ago. Instead the first major aeronautic institute in Pakistan was inaugurated 5 years ago.
"Answering a question regarding PAF's future procurements, ACM Sohail Aman stated that in addition to force multipliers, the PAF is looking to procure a 5th generation aircraft and that they are looking for it in both, east and west." and PAF has realised to build a platform you need whole eco system so considerable amount of investment in terms of human as well as technical area is underway to understand
Again, this doesnt mean that PAF will design their own fighter but would be able to contribute to fighter systems. It doesnt mean they wont. But if we are looking at this realistically, PAF is NOT yet set up to design its own fighter, meaning whatever comes of the avionic city, it will likely find its way onto the PAF versions of a 5th gen fighter.
4.
Please realise that all fighters in PAF have dedicated role and putting JF17 under all role is unfair as it will create "Cheehco ka maraba " some gentle man shared F35 and why its a failure by F16 designer is a classical example . do realize that at the end of 2035 all JF17 have to be replaced so window is short specially after modern era development in avionics and CAD
All fighters having dedicated roles in PAF is one of the major problems. Having a different aircraft for each unique role is foolish and harmful from a cost/maintenance and logistic perspective. The exact point of a
MULTIROLE fighter is that they can be used in
ALL major roles. Just like Gripen, F-16, M2K, Mig-29, the JF-17 should be competent in CAP, CAS, Interception and Air Superiority Roles. It is not "UNFAIR" to put the JF-17 in these roles as it will be able to perform reasonably well in all the roles...that it what it was designed to do. Will it be a top flight Air Superiority or Strike fighter...no but it will be more the sufficient in each of them, especially when backed by a larger more capable fighter (J-31). It is the backbone, not the spear tip.
Now this is not to suggest the PAF shouldnt be looking at other options or that it shouldn't actively be developing next gen systems. On that we agree, and if possible to do it in the timeline you suggest, I'd be all for it, but we disagree on what timeline is realistic. I think for this, it will take another 25 years, but that is my opinion given what I see is the current state of affairs.