the idea is that mining will become profitable if the bitcoin price goes up. Unfortunately I dont think the price matches the difficulty but I think that will change very soon. 
Mining is profitable for those with powerful and efficient mining hardware and cheap electricity. Otherwise they wouldn't be mining.
If you're hoping that the price increase will make your 335 Mh/s USB block erupter profitable again - that's unlikely to happen (unless there's x100 pump before difficulty adjustment).