if Pakistan acquired J-15s for the long-range strike aircraft potential it will probably awaken many of those Indian fanboys screeching about inducting the Rafales.
however I seen many people mention previous possibilities such as the F-16 & Su-35
Su-35, yes it maybe a possibility, but the question is this, is Russia really willing to risk a sale of 24-48 jet fighters to a country they are now formally opening defence ties with and jeopardizing one of their major defence monopolies (India)?
F-16 seems logical since PAF does operate anywhere from 50-70 F-16 on varying sources, but the main reason (from my guessing) is Lockheed Martin doesn't want to mess up a possibility of exporting the F-21 to India, which in turn all the F-21 is a more highly updated and advanced variant of the UAE F-16 Desert Viper (that's what the F-21 is based on). and a sale of 110 F-21s is more sensible for LM then a sale of 24-48. (not picking sides, just mentioning)
and the EFT pitched to PAF by Italy was basically kind of like what the heck, sine the Italians were only offering the Tranche 1 models and not really wanting the possibility of modernizing/overhauling it. even Spain pitched Tranche 1 Typhoons to Chile, Colombia and Peru and all 3 declined.
as a previous member mentioned, the only way to buy the Typhoon is get a BVR capable system to counter that of the Rafale's
so in short, it is perhaps more energetic/logical for PAF to induct the J-15, since there won't be no political redtape as seen in both the Su-35 & F-16 possibility, and you guys could induct the J-15 + BVRs without worrying about sanctions, or "nah sorry we can't sell" attitudes.