HTC in particular has a long history of keeping a few different systems in their lines. They can prioritise Windows Phone more. But with Nokia there already the

HTC in particular has a long history of keeping a few different systems in their lines. They can prioritise Windows Phone more. But with Nokia there already they might want to keep it approx. 50-50 anyway. Others like Motorola and Samsung, I'd expect them to stick to Android whatever happens, at least for the high end. This is why Google is doing this.