A second mtgox is just a matter of time. However what an exchange does is not the determining factor of value. People will just move their money in and out when they need to instead of using exchanges as "banks".
One of the side effects of masternodes is the incentive to pull money out of exchanges. It will therefore prevent fractional practices, reduce short-selling potential (when short-selling is activated) as well as allow DRK to be more stable in case of an MtGox scenario of a big altcoin exchange, compared to other altcoins (less DRKs stored for hacking, due to many DRKs being assigned to masternodes).
Gox was a known quantity. You had to be deaf and blind to not know something was going badly wrong there.
People had weeks of warning to get their money out.
If a "regular" mainstream exchange (like, say Mintpal) got hacked with no warning and people lost their funds, that's going to be much more damaging than Gox ever was. Don't be so sure that things can recover so easily from that.
What's more likely to happen is that it's the end of centralised exchanges and trading goes "offline" to decentralised hosts such as the NxT block chain or Etherium when it appears.
A coin only has value though trading. Trading needs exchanges. Ergo, a large part of the coin supply is *always* going to live on exchanges.
The reason I've got mine there right now is that post RC3, things can go two ways:
- the price stays where it is or increases a little as people see a stable release and the coin gains confidence
or ...
- speculators who have "ridden the wave" up till now decide that that's the show over for now - at least till - till RC4 and take profits en masse, pushing the price to around 0.008
You have to weigh up the 2 risks: losing all the value in an exchange hack or losing half the value in a cash out after RC3.