hasnain0099,
My worry remains the up and down relationship between Pakistan and US. The SABR AESA is a perfect example of an ideal upgrade in a few years, but would such upgrades even be allowed? The Americans usually have no problem allowing upgrades to f-16s in Europe since they are able to control those nations so thoroughly, or were the Indians to buy them...but when it comes Pakistan, the various US lobbies all work against us.
Which leaves us in a dilemma...we know the block 52s are fairly advanced for now...but lets say 5 years from now the US has left Afghanistan and wants nothing to do with us, will they even allow spares to come are way, much less upgrades to the radar or electronic counter measures suites. The aim-9x along with the new aim-120Ds are game changers and we may never be allowed access to them. So while Rafales and Eurofighters will employ Meteors and next gen short range missiles, our f-16s will be stuck in the early part of this decade.
What you say has great merit, but the Americans have never allowed our relationship to be predictable enough for us to breath easy. And id assume the PAF is betting on this as they procure more advanced jf-17s and j-10s to mask the eventual inadequacies of our f-16 fleet.