If nokia was to completely open up their platform from ground to bottom stacks under the GPL they would have an advantage with the real FOSS community over Android who uses an Apache v2 license which i'm pretty sure will be used and abused by the carriers trying to gain a competitive edge over the others... That will slow them down even if they have 100 more programmers, we could all share code on everything and always give back.
They make money on hardware and service not software after all...

(I'm not trying to start a BSD vs GPL here, but in a context where the main group pushing a BSD like license is a comercial entity, i doubt it will be a success...YMMV)