not saying i agree with it generally, or with the lack of a direct 1 for 1 replacement for what it can do, or its raw survivability.
but the A10s were slated for retirement, and only recently did the AF pulled back from retiring them and is looking at some options to extend their service life.
and their mission is slated to be taken over by the F35.
though obviously the F35 isnt going to be tank busting with a cannon. but on the other hand, the A10s came into service about 10 years before helos really came into their own as tank busters in their own right.
and A10 CAS was always somewhat redundant with the helos, its primary advantage being payload and loiter time. other hand, even as rough a field as the A10 can use, nothing beats the reaction time of a helo located at the FOB itself, whereas the A10 still has to fly in from elsewhere (we still havent seemed to max out using the A10s rough field ability, seeming saving it for a real SHTF scenario)
loiter time and bomb trucking is seemingly going to be taken over by drones. predators and reapers having done quite well.
general ground attack the F35.
and CAS can be done by helos. the new Cobra upgrades in the marines are truly spectacular. the army is looking for an apache replacement soon though.