No one is discounting the need for air power.
The question is whether or not a separate service is necessary and whether or not it is cost effective to have a separate service.
The last time we saw serious Air-to-Air combat was WWII. I'm sure the USAF made sense at the time.
Will history repeat itself? Will there be another serious air war in the future?
The British favored the F136 obviously. Willingness to contribute to the development may not have been there.
However, recall in the end that GE and RR offered to 'self fund' the remainder...
The A-10 is going away whether you like it or not. It's been on the chopping block for YEARS and keeps getting reprieved. Unfortunately there is no direct replacement for what the A-10 does best...
...or they could just upgrade all the T-1A's with the 400XPR packages. Those airplanes aren't that old.