I think that Microsoft will probably end up buying Nokia outright at some point if this slide continues, especially if Google gets serious about making it's own hardware via it's Motorola Mobility acquisition.
note: the downvotes are so predictable on threads like this...
Who's plan? Care to elaborate?
To be sincere, I imagined the plan was to make WP7 a success with Nokia's help (after all, they know how to sell phones to telcos, if not to end users). Plan B was to acquire Nokia's patent portfolio. I never had much faith in plan A.