Dropbox needs to figure out how to stay in a commoditized market where their special sauce is being integrated into OSes and larger offerings (G-Suite.)With respect, that is Dropbox's problem. Dropbox needs to do that, But I don't need Dropbox to do that.
The same is true of music-playing apps. Once they cost money and added value. Then platforms all started making "play this music file" free. The purveyors all tried to add more value. And there are a few specialized music players kicking around.
But most went away, the business model was no longer viable, and the move into adding lots of functionality pushed them into a niche.
I agree that Dropbox is facing an existential crisis. If Apple delivers on some of its promised new iCloud folder sharing functionality, I will end my Dropbox subscription, and no amount of "We're a collaboration platform" will change that.
Dropbox knows that, and is going in the direction of getting money from someone else. Will they succeed? Maybe, maybe not. But either way, most of their existing user base is finding their less useful and less valuable as they make this transition.
Shrug.
I have witnessed this so many times over the last thirty-five years. One set of forces acts to take something that was originally just for companies, and "Consumerizes" it. Spreadsheets are common for people to track all kinds of personal things. Kids use them in school.
In the opposite direction, companies chasing the money "Enterprise" their consumer offerings, abandoning the users that built them in the first place.
Same as it ever was.