I'd say it's unlikely the US will face an air-superiority problem in the foreseeable future. Here's why(in my opinion):
Against any LIKELY air superiority threats the US will dominate the sky..not just because of combat proven quality aircraft and weapons systems...but more importantly training and tactical information advantanges like a fully integrated C3I capability..knowing WHERE your enemy is at all times and the ability to DENY your enemy the same capability is paramount.
Imagine being a US fighter pilot on CAP at night.....no radar emissions setting off enemy "fuzzbusters" because you're relying solely on a datalink providing you with a "god's eye view" of your aerial battlefield.
Compare that with an opponent's MIG 29/SU 27 air superiority airframe forced to use his internal search/intercept radar which looks like a flashlight in the dark because his own C3I capability has already been smoked by SEAD Wild Weasels.
In the end the MIG or Sukhoi driver is dead even if he is the better air-to-air pilot because he can't "see" as well as the US Air Force driver.
Just my opinion