The point about starting a bidding war is particularly cogent. I hope that if/when acquisition of Dropbox does occur, (1) the founders and employees are well rewarded for the fantastic product they built and (2) the service is not discontinued in any way. Over the past year or so I've come to rely on Dropbox; few pieces of software have ever been as integrated into my daily routine.
I'd be terribly sad if google bought and killed them.