You pretty much nail it. But that it hasn't happened yet, doesn't mean it won't. From recent news, I am fairly certain all 3 (G,MS,A) have big plans on the ta

You pretty much nail it. But that it hasn't happened yet, doesn't mean it won't. From recent news, I am fairly certain all 3 (G,MS,A) have big plans on the table for balls-out cloud-everything infrastructures. Apple is the only one making it obvious with their new datacenters and the iTunes cloud rumors. Google is rolling out a cloud filesystem along with ChromeOS. Microsoft, well, they'll probably stumble along like Google and Apple's retarded brother. The computing industry, as a whole, is undergoing a massive shift, and I'm afraid that really innovative companies like Dropbox have simply provided the template by which the filesystems of the future will operate.