For a while there, I know they were worried that indium was going to run out. I read an article where the author listed a bunch of things that we didn't even know we rely on, that might soon be exhausted and indium was one of them.
It's not absolutely critical as a mineral, I guess, although I think they use it in solar power cells.
But, the guys who mine it reckon that with recycling and improved mining methods, it isn't actually going to run out any time soon.
Assuming they aren't being overly optimistic, we can hope for the best!