Dropbox should buy Evernote, especially since they're in trouble, and fix one of the biggest problems with that service by making it sync using Dropbox (and making its data easily accessible).
Culturally speaking, Dropbox and Evernote do not fit. I've been a long time Dropbox user and in the process I've also used Google Drive and played with OneDrive.
If there's something that sets apart Dropbox from its competition is that (1) Dropbox is simpler (2) without compromising on the really important parts, like having a history or Linux support and (3) the set of available features work really well. Not sure what the right word for it is. Minimalism?
At times it's annoying of course. For example Dropbox's native client is the best, but their web interface sucks. Like for example if a folder is too big, the web interface will refuse to move it. Comparing that web interface with Google Drive is not even funny, though the native client and the cross-platform support more than makes up for the shortcomings of the web interface.
But going back to Evernote - seriously, it's a piece of shit and I always wondered why people use it. I would rather have Dropbox build something minimalist by themselves than to acquire Evernote. Or let others build things that integrate with Dropbox. I just bought licenses for 4 different operating systems for 1Password precisely because it integrates with Dropbox.
Dropbox should buy Evernote, especially since they're in trouble, and fix one of the biggest problems with that service by making it sync using Dropbox (and making its data easily accessible).