There's no doubt that the F-15 is a pretty damn cool-looking aircraft, so it's natural to want to see it keep on flying, just because it's so iconic and awesome.
About a few months ago I was reading an article from god knows where, I can't remember. But it was talking about the USAF looking into to new F-15 options (which I don't think they would follow through with) and the article mentioned a few "advanced" F-15 types that could augment planes like the F-22, -35, etc., etc. Among them were a few cool-looking and neat concepts that I looked up like:
-F-15SE "Silent" Eagle: a Strike Eagle with internal weapons and option for CFTs, increased weapons load, more range, less weight, enhanced EW, AESA radar, fly-by-wire, low-observable technology, and canted tail
-A derivative of the Saudi F-15SA: kinda like the SE, except no internal weapons, canted tail, or LO technology
-And the F-15 2040C: Being faithful to air dominance, this is essentially a single-seat missile truck (16 AMRAAMs were carried in the concept's plans), and that's all can muster up about it. We can assume that it may have fly-by-wire, enhanced EW, etc.
If for some reason the Air Force goes "hey let's buy some advanced F-15s!" then which variant would be most useful, be the most eye-candy, or the most supportive (in terms of our projected fleet of the F-35s and current fleet of F-22s) to you? Which one(s) would you like to see built for export?