Oh and @Storm Force, I do agree with you - the wargames the US has had, clearly show a very very lopsided win-loose ratio. The only time an F-16 scored a win was when it'd get blown to pieces right after firing off at the -22. My point was, that the benefit of stealth can be had with 4.5th gen too.
The Eurofighter consortium's been disputing that their aircraft is "4.5th gen" compared to "5th gen" F-35, because according to them, this implies that their aircraft wouldn't be able to compete with the -35. They clearly feel that it could. Alot of literature coming out of Australia also suggests that they were very suspicious of the practical benefits the F-35 offered, even their members of parliament raised questions about it. I'm not disputing that 5th gen aircraft, the F-22 specifically, haven't had alot of success in wargame scenarios and training exercises. My point was, that modern jammers in relatively smaller aircraft(that naturally have a smaller cross-section) enables even outdated equipment like the MiG-21 to get close to the F friggin' -22 undetected, the only problem there was that the MiG-21 doesn't have modern gen warfare equipment to effectively engage it.
The current generation of radar and avionics technology that gets installed in 5th gen aircraft, is equivilant to the level of technology 4.5th gen aircraft are being fitted with these days. There's nothing in 4.5th gen aircraft, that prevent them from being equipped with AESA radars, latest gen jammers and EW warfare suites, missiles and everything. My thought was that in the short run, 4.5th gen aircraft equipped with modern gen equipment could "cut the bread" as it were. In a defensive environment, this, paired with modern SAM systems seems to be the policy the PAF is pursuing.
In the long run, even Pakistan would get 5th gen aircraft. The last Airforce Chief even said something to the effect, that we'd be adding 4.5th gen and 5th gen aircraft within the next decade. So, sure there's a limit to how much modern gen stuff you can incorporate into older aircraft(and whether it's worth it, upgrading old aircraft with limited flight hours left in 'em), alot of countries are developing 4.5th gen technology, and it makes sense. The Eurofighter's supposed to go through a modernization programme, the stuff that comes out of that would be flown by leading European countries for decades to come.