So given that, if they were going to put some eggs in another basket, why would they choose Ubuntu over Android, which has an existing application base and at least some user awareness?
It seems like we're at the same stage right now in the mobile OS world as we were in the personal computer market back in the 80s, with multiple competing platforms such as the Amiga, Atari ST, BBC Micro, Commodore 64, PC, Mac, etc. Each had it's advantages, and each had significant success, but there's actually only room in the market for two or three of them long term.