Re: "It' really a poor mobile world where the only mobile OS choice is Android..."
Maybe so, but that's the world in which we live. Others have tried and failed, it's no surprise that Blackberry have admitted defeat in the OS arena.
The third option on the desktop is pretty mature, has a healthy app ecosystem, and you can fudge Windows applications onto it if needs be - there is no equivalent OS for phones . Blackberry tried having their own OS that also runs Android applications, but that didn't go so well, and all other efforts have failed, so you can't blame them for throwing in the towel.
Canonical look to be the best hope for getting an alternative phone OS off the ground, but overcoming Android's market dominance is going to be quite the feat.