For me that's still what it's best at and what it should focus on. "Paper", Signatures, Password, to me that feels like they're desperately trying to find something to not just be a reliable external hard drive for people. Oh and of course their number one ambition, trying to convince me to upgrade to whatever more expensive plan they have.
Dropbox could have carved out a niche for itself as a platform for backup and sharing of files. However, the amount of investment capital doesn't allow them to be just a successful medium sized enterprise.
Being the best in a completely commodified area is tough, especially when that solution set is thrown in for free in the world's most popular productivity platforms-- Office 365.
Dropbox has the best sync clients, but that's not enough to save them from being a commodity. Dead-simple and reliable sync seems like a nice-to-have that isn't going to save them from the incredibly large footprint the likes of Microsoft already have in enterprise markets. An IT purchaser might not care much about the usability difference between OneDrive and DropBox (which I'm not even sure exists since the last time I used both.)
Dropbox needs to think of what apps you can build on top of it and let people build those apps. They are a data lake. Enable advanced analytics and ML etc...
