Yes, especially in a market where there are many, many users of computers who might have occasion to share files who have not used (or even heard of) any of the available file-sharing solutions yet. I am a sporadic user of Dropbox strictly for back-up of documents I produce, and a moderately frequent user of Google Docs for collaborative editing who knows a lot of other Google Docs users. I could see Google making huge gains in market share, turning it into tomorrow's "first mover" from the point of view of most users, for a file-sharing service.