This is just life and death of a business and it is interesting to watch how these exchanges are being removed from the economy, by essentially a Darwinian survival of the fittest rule, the least secure get hacked and taken off line. We lost bitcoin-central, bitcoinica, mtgox on the way but BTC-E is going strong and so is Bitstamp, kraken are doing a good job and so are btcchina. The market does not need regulation. Gmaxwell has suggested exchanges provide an anonymised form of financial data to confirm their liquidity and I know BTC-E have suggested they will do something like that. Of course people may suffer losses along the way and that sucks but you can buy and store them locally and this sort of thing will never affect you.