That's really crappy
I hope it's resolved soon. And I really doubt they'll resort to banning .exe's. If they just stop panicking for a moment they'll realize that any file can be a vessel for malware, and banning .exe's would just alienate their honest members.
Anyway, the same thing happened to willhostforfood, and they came out okay. And they're not nearly as big and useful as dropbox. I'm sure once the dust settles everything will be back to normal.