What would stop them from supporting android apps within meego? There's rumors that the RIM playbook is going this route.
1. http://www.bgr.com/2011/01/26/exclusive-blackberry-playbook-...
Many APIs have had the promise of multiple implementations (and some have succeeded in at least making them, ie OPENstep's many implementations, and Java) but it seems to have not been widely used.
Except, well, unix. Heh, I suppose it has been done successfully.