While most F-15s are in good enough shape to keep serving, I think it's time for Congress to write Lockheed a check for at least another 100 Raptors, and probably more.
The R&D costs have already been recouped, and it's also obvious that the F-15s are aging, and arguably not well. The F-22's a good plane, and it's only $116 million per plane on fly-away costs. For a Congress that can spend billions in earmarks each year, certainly an earmark for another 100 F-22s isn't unreasonable, is it? Maybe two runs of 100 would not be a bad idea.
There ain't no such thing as too many Raptors.
I mean, if you're gonna pork, make it useful pork!