Well that pretty soon is gonna be atleast a decade. By 2018-2020, in small numbers, 3 or so airforces are gonna start inducting these 5th Gen fighters, namely, China, Russia & India.
And what do you suggest we do for one full decade ?? Sit and see our 2nd Gen fighters get wasted and airforce numbers go down ?? And even when these major airforces have inducted the 5th gen fighters, they are gonna keep their 4th-4.5 Gen fighters for much more time.
And PAF has more then a decade time to look for things around and see if it can get its hands on a 5th Gen fighter and am sure its gonna be from the Chinese.
So, look at the present, the future you are talking about is a decade away.