I think +Canonical
have a fantastic opportunity to do something truly revolutionary, now that they've killed Ubuntu One.
Going up against Dropbox, Box, Copy, Drive and all the other clones was going to be extremely difficult at best, and provided very little additional value to core users.
Providing an Ubuntu account, however, is brilliant.
Imagine that you, as an Ubuntu user, have an online account that stores the state of your installation: your OS version, its configuration, your installed packages and their configuration, and your documents.
"Why would I want that?", you might ask.
For several reasons, I would answer.
For starters, you would be able to do a clean reinstall of your machine just be installing the OS and logging in. Everything else would be downloaded and configured for you, just the way you like it, down to the documents on your Desktop, the Writer format of your documents and your browser bookmarks.
You could also do a perfect clone of your office machine at home, and make sure they're always in perfect sync.
Can you imagine the possibilities?
Ubuntu, Canonical, please think about this. It's not an opposing view to your convergence goals, it's complementary.