It's definitely convenient, but I'm not sure I would call it game changing. Unlike Dropbox, where the sum of the parts was the difference between a power user being able to do something, and your average user being able to do that same thing, this is targeted at an audience that already has the mess of existing tools and is working fine with them.

It's better than what's already there and they'll sell a lot of them, but I wouldn't go so far as to say that it has made the impossible possible.