It would be a loss if Canonical drops support for desktop as in my experience Ubuntu desktop is the easiest and most practical desktop Linux available. I like that Shuttleworth is committed to it but hope that that lasts.
Developers of desktop software usually live from unit sales of their software and consumers don't pay for subscriptions, trainings or support.
So this leaves enterprise customers as the only source of income for many distributions.
EDIT: typo are => as
For MS is is virtually a loss leader to push things like Active Directory and Exchange.
They would be all out of business if that was the case.
I tried this a couple years ago on a N6 and was very unimpressed as it was incredibly slow and unresponsive, had no apps you could install, and just barely met the definition of "phone OS". It was more of a PoC and didn't even have a shell prompt. Things have probably improved a bit since then[2], but I would expect you'll get bored of it. I follow the android ROM scene and (unlike iOS) I've never seen people say "#$%$% all this! I'm gonna run Ubuntu Touch from now on!"
Still, it's fun to install just so you can say you did.
[1] https://play.google.com/store/apps/details?id=com.tassadar.m...