If it concerns you, keep your cryptocurrency in cold storage (this might be something you already do) and only use a small amount on cloud-based services. This is the great thing about the base protocol, it is trustless.
If I'm concerned about the fact that MtGox has proven completely unreliable just about the same time their competing currency Ripple is ready to launch, and I'm also concerned as to just how much more control they may be able to exert, The smart move would be to move all my business and that of anyone I know away from MtGox and any other exchange not based in the US or UK where regulations should offer some shelter for investors. Placing my bitcoins in cold storage only means that when whatever damage they intend is done I'll be holding worthless Hex strings. I'm not saying they ARE intentionally crashing their site or that it IS a conspiracy to reduce confidence in bitcoin and push people toward Ripple. However, if it quacks I generally expect to see a duck.
