The only thing that can possibly work (assuming win devs would have a hard time switching to maemo, not so sure at this point, expecting quality devs in M$, even if legacy stuff makes them most hated, or just most-used-platform getting most-popular-hate) and hopefully is a plan from the beginning:
fire all maemo/harmattan devs as we cuddle with WP, WP fails completely, hey guys we didn't mean it, but stock plunge and world crisis makes us offer you 1/2-3/4 of what you've been paid so far. Hope some will return. Then there is also option of M$ buying Nokia. Ballmer probably won't, but Gates could gain some pr points in funding open-source mobile OS for africa (and TMO), not like this would be a massive hit to android/iOS and not even a graze for desktops