If the issue is really that the NSA is trying to force them to put in a backdoor and they are pulling a Lavabit, then previous versions of TC should still be good to go -- the backdoors wouldn't be retroactive, would they?
Even if there is a legitimate vulnerability, TC would have some utility for the average person: most people looking at your usb stick (say) and seeing a 1gb .tc partition wouldn't even know what it is, let alone be able to exploit a vulnerability to access it. But I understand that this won't satisfy the truly security conscious.