nothing is impossible in this world. i think, regarding the latest news about nokia, that we shouldn't eliminate this hypothesis.
All circumstances are here:

-nokia is frail
-elop comes from microsoft
-nokia is working with redmond
-microsoft give exclusive prerogatives to nokia on Wp7)
-others competitors are not really interested by wp7 (no hardware or announce since earlier 2011, no news a MWC/CES)
-nokia's stocks falls