If you control storage and sync, you control a lot. (There’s not much left but apps, media, and the pipe.)
Dropbox has storage and sync, and now a growing collection of apps: Mailbox, which is expanding to the desktop, and now Carousel, a photo- and video- sharing app. Expect more of these consumer and business productivity apps — both homemade and via acquisition. The Dropbox OS is taking shape.
Given the choice, I’d probably rather someday buy a Dropboxbox than a Chromebook.