Cold War tech, far more effective aircraft exist nowadays. The gun is no longer a MBT killer, leaving it to destroy armd inf/mech inf which will travel with armour and integrated AD.I wonder if they'll get the chance to prove themselves in their original role and theatre before they go out of service. I reckon Prince Vlad will delay any moves into Estonia until he's reliably informed there are no more A10s serviceable.
Given reasonable suppression of Russian air defences , I reckon they'd take a toll of armour, even though it would be two way traffic.
Low slow and nearly invincible worked in the 70s and 80s but they wouldn’t last long in peer/peer(+) engagements.