Also gonna put this out there, and I have the greatest respect for the GAU-8, but the A-10 would be singularly useless against supersonic bombers and anti-ship cruise missiles.
So entirely unsure why you decided to add that into a quote about supersonic bombers and cruise missiles.
Eventually yes. They're heavily invested in using the f-35 for EVERYTHING. And the different f-35 A, B and C versions are almost different planes entirely. I heard that they have only 25% common parts or something like that.
In my opinion in USAF service it'll be outlived by the F-15EX at least. In the USN / USMC, it'll likely need backup by F/A-18 Super Hornets for the same reason as F-22 needs F-15.
Until generation 5 becomes cheap or the main adversary, there'll always be a need for generation 4 and 4.5 backup to fill gaps in the sky.
The RAF has already designed, named and costed the replacement for the F-35 Lightning II (called Tempest).
It's becoming a political and logical nightmare. For example, the engines are serviced in Turkey. Which means 2 things.
Broken engines need to be shipped from the UK to Turkey.
If turkey are being naughty and we give them a slap, they'll decide not to allow in or give back our engines, leaving the planes grounded.