The market cap plays no role of importance here. It all depends on how much buy support there is available on-exchange. Judging purely on that fact, these coins will result in a $50-$60 decrease if dumped at once on Bitstamp. In other words, it's peanuts. Bitcoin is booming, and thus you'll see a lot exchanges pop up trying to take their cut. In most cases these exchanges are pushed online as soon as possible, which mostly isn't a good thing in terms of security. Result is that we are likely going to experience more of these thefts in the coming year(s).