Dropbox will be one of the next Bending Spoons acquisitions. Low growth, none of the upsell or product extension things they've done have really worked out, and no-one's idea of what the future looks like.
So, Google should sell Google Drive, Box shall close down, PCloud must cease to exist, Mega shall sell itself to a three letter agency a-la Crypto AG, Sugarsync shall vanish, etc...
Yet we are here. These are all stable products chugging along.
Bending Spoons need "great" deals to go after, such as Airtable, etc. Dropbox has a market cap of ~$8B, and it's not "cheap" compared to revenues, etc.
If Dropbox goes "down" in the next few years, perhaps you will eventually be right.