Mods please forgive me, I tried not to Flame in here...
Jf-17 thunder as you call it, Is not going to cause a serious stress to IAF, because of the following reasons
1.Its not a front line fighter....
2.by the time you have 100 of this we will have more than 200 sukhoi 30 MKI and a few LCA's which has got limited series production already....
3.JF-17 is a 4th gen aircraft,got no potential for deep strikes, but can defend its land where as Sukhoi 30 Mki is a deep Striker.
4.FC-1 is still not Inducted in PLAAF, this could very well show Its potential....