A-10's replacement is drones, says the writing on the wall.
A-10 was developed for a Fulda Gap Cold War escalation, when Soviet Union had many many tanks at its disposal. China doesn't have near as many tanks as Soviets did, and now Russia's stocks are being depleted in Ukraine.
When you have drone/satellite coverage and know where everything is, you don't need loitering CAS as much, you can strike before threats are immediate with standoff munitions like what F-35 deploys, or artillery. Anything else you can clean up with drone Hellfires etc. loitering with less risk.