Like others, I really think Canonical are focusing on the wrong priorities here. I've been using Ubuntu as my sole desktop OS for most of the last 5 years and am really pretty happy with it - even Unity doesn't annoy me as much as many. But still there are rough edges - small things that don't work quite as you'd expect, or essential configuration settings that can only be made from a command line.
But what constantly makes me question whether I should continue is the desktop applications. I'm no fan of Microsoft Office but on the whole it does at least work, whereas I'm constantly hitting problems with LibreOffice with things that just don't work, random crashes, etc.. Actually the Writer is pretty good (and I prefer it to MS Word) and Calc isn't too bad, but the one that really worries me is Impress (the PowerPoint equivalent) - random font changes, completely arbitrary and inexplicable changes to styles, bullets, numbering, make it barely usable for anything serious. These applications are rich in function - they just aren't reliable enough yet.
So, if Canoncal want to gain more traction with Linux on the desktop, they should give a lot of support to LibreOffice (or to Apache for OpenOffice), to bring those apps up to a fully professional quality. The rest of the attention should be devoted to removing all the remaining rough edges in the OS, of which there are not too many these days.
And only when they've done that and have nothing useful left to do, should they even think about playing with tablets and phones.