Video, like social networks, seems to be a market that lends itself to a single winner taking the most marketshare. (It's a virtuous cycle: YouTube has the most viewers, which means it's the best place to put content, which leads to more viewers.)

I'm not sure the file sharing market has such features. I could easily have both Google Drive and Dropbox on my machine. I'd probably end up using the cheaper one more. In the end, I think the consumer will win; capitalism at work. :)