Dropbox has the same problem a lot of the moderately successful unicorns have; it's a good product managed by smart people that would be much better off as a right-sized stable lifestyle business a la 37 Signals / Basecamp than as an attempt at a world-beating massive-growth juggernaut like Google or Facebook. Unfortunately for them (and Evernote, and a whole host of others), once you've signed that deal for the huge…
I like a lifestyle business, however if you can clearly go for a $10B instead of $30M while spending the same 10 hours at work and surrounding yourself with 10 times the amount of smart people, then why not.