But today, Android has huge market momentum, so a phone vendor switching off it would be abandoning most of the available customers, something they are extremel

But today, Android has huge market momentum, so a phone vendor switching off it would be abandoning most of the available customers, something they are extremely reluctant to do Wrong, consumers aren't attached to phone OS's like they are to windows on the desktop. You'll be betting wrong, if you bet that windows mobile is just "going to go away".