google has ceded the lead here because files suck. users don't want files or filesystems. look to how iOS works for how most users want to access their files: they open an app and the documents that are relevant to that app are available to them. whether that data is stored in a filesystem or in a database, locally or remotely is totally irrelevant. google docs works like this. picasaweb (or g+ photos now i guess) works like this. google music works like this. the very nature of dropbox is to not be the ideal solution to the problem they are solving. they're the realist's solution, google is going for the idealist's solution.

imho, google is leading the market here by not being a part of it.