It's always easy to look to near future, but i think this was right thing to do looking past 6 months.
Symbian was clearly pass it's time and had been given 4 years to become something, it didn't and Android has been eating it like a cake and i saw zero reason for a change over there. Anna update is one more laugh worthy example here.
WP needed a shock start to get any interest towards Nokia anymore, get developers to WP and for once in 4 years make it clear what direction Nokia is going and hold on to it.

Nokia got the money to go trough this easily, that's not the problem, but they need to ensure that future platform actually moves forward and not have all this open "what if" stuff going on and if they do they are keeping it under the wraps.
Not what that total failiure of OPK did to Nokia.