Of the countries the US might go to war with conceivably in the next decade, the only significant airforce is Iran's rusting and jerry-rigged 40 year old F-14s. The US doesn't make a habit of attacking countries that can credibly fight back outside of an insurgency model, and any plane the developing world's countries buy from Russia or China would bankrupt those poorer countries with maintenance and fuel to give their pilots credible flight time. I'm going to go out on a limb and predict that there will never again be a serious aereal dogfight. The US only picks fights with those that can't fight back.
The US has already used the F-22 in Syria, where its stealth gives it extra protection against any SAM system controlled by IS.
