UAV's cannot replace an A-10 armed with multiple Mavericks and a GAU-8 (plus a human who can act independently, and quickly) when dealing with enemy armor or emplacements.
LANTIRN, Helfire, BLU-108 - these have nothing to do with A-10 vulnerabilities. The objection is that these (A-10's, Su-25) are too vulnerable, and you list offensive weapons? That makes no sense.
Any CAS needs to be accompanied by air superiority (temporary or permanent) and appropriate countermeasures for remaining AD... HARM, ECM, flares, etc.
There is internal armor (a lot of it) in the A-10. A 23mm shell cannot penetrate the cockpit area from below. They are survivable, agile, and effective, made even more so by a new generation of intelligent offensive weapons.