Thing is, this is all predicated on the idea that people want one device and not several - and that's absolutely not what's happening.
I was reading an article recently about "four screen" users - people who have a smart phone, tablet, laptop/desktop and a TV and how we transition between these devices.
The key thing is how apps can sync and transition with you - so you start to watch a film on your phone on the way home and when you get home, your TV picks up where you left off. Then, when you go to bed, your tablet picks up where your TV left off.
I would also put good money on the fact that most "casual" PC users now have a laptop and not a desktop - I would imagine that only "power" users have a desktop (in the main). So, I'm not really sure who this is aimed at?
Casual users (who don't typically have a monitor at home anyway) who Ubuntu is expecting will connect their phone to a TV?
Or "power" users, who have a monitor but would rather use their phone rather than their custom-built, water-cooled monster of a tower PC?
I don't get it.
Where's the market for a (relatively) low powered PC that requires a monitor (or TV); doesn't have an established app store etc?
A great illustration of why businesses should have product managers - I would be amazed if Ubuntu used a product manager for this - and if they did - he needs firing...