If your friends are asking if they should worry about getting back their money that's in the bank, I'd say that's pretty ridiculous -- the FDIC will get it to them. The real concern you should be having is about the value of that money, and on that question, it really doesn't matter if your money's in an FDIC-insured account or not.
They'll get you, not by reneging on the FDIC's guarantee, but by making the money worthless when they finally get it back to you.
As always, it's not inflation that bothers me, but interests rates not reflecting it.
Couldn't have said it better myself.