I would like to share the information we had till now, that is, 5th gen concept isn't as successful in dog fights/other capabilities etc similar to 4++ aircrafts. it is very useful where the stealth tech is key for a mission but if it may get caught with a true 4++ aircraft like SU35/SU30mki, Rafale, F15 etc in the middle then chance are less that any of this 5th gen may either move forward or even turn back also, whether its F35/F22/Pak FA/FGFA/J20 ...... no wonder US has closed production line of F22 as they have got it in enough number, around 180, for the special missions where stealth tech will be the key but their main strength is still F15, F16s, SH etc.......
hence, if you are in hurry then you may have 20+ Pak FA by even 2014, like how Russia has planned. and if little cautious then wait till 2017/18, and if you want to get the most improved version of PAk FA/FGFA then wait till at least 2022 when its production line will get matured, with fixing every possible concern, to reach the 'Fitness Landscape' of this project like how HAL has planned, as it looks like. also, this way you may have little time to see how US's professionals go with F35 about which we are getting news that they are now going back to the design stage to fix the problems they have on the final stage while they already have over 20 prototypes. as, anyhow 5th gen stealth aircraft is a concept originated in US and if they can't make a true stealth aircraft which may perform good dog fight/have other capabilities like 4th gen, then you would think that Russia+India and China both would also have the same concerns as US will have with F35/JSF......
all these arguments are based in the light of the best available information only and we must wait for next 3-4 years to see how professionals working on these projects in US/Russia/China are ended up.......