Survivability in the sense that it can fly with 1 engine, with an elevated and heavily armoured cockpit and airframe. It will still go down if it loses a wing to a missile. It certainly couldn't fly against modern AA tanks like these. This is why the F-35 will be a better jet, it is capable of both Wild Weasel missions and CAS.
Sure, anything that goes up in the air can be shot down. The A-10 was designed to get down and dirty and take a beating. How much of a beating is the F-35 designed to take? What happens if an F-35 loses an engine. Oops, it only has one. Will the F-35 be able to survive AAA, let alone the loss of a wing? I doubt it. The F-35 is trying to do many things while the A-10 just does one thing: kill armor, and it's very good at that job.
BTW, how many F-35s (of any variant) are currently deployed? How much does one F-35 cost vs an A-10?