The forum's Pakistanis who cheers for the rejection of the F-16 as front line combatants are doing it out of their childish need to poke at the US, not because they have any real understanding of military affairs in general, let alone air force in specifics.
Despite the JF-17, which is a joint venture with China, Pakistan do not have a viable native military aviation industry. The reason why countries must import their defense is because defense is an immediate need, not one that can wait for indigenous development and maturity. Therefore, before the rejection of one source must be after the security of an alternate. Everything else, like spare parts and ordnance, are peripheral.
I fully respect Pakistan's decision to reject the US as source for Pakistan's defense needs, if it ever comes to that.