I side with the group that sees Forstalls forced leave of Apple is a positive sign.

Forstalls perceived success might be a halo effect of Steves visions that he was tasked to build. Now with being forced to innovate on his own I only see small iOS evolutions. Where Apple was once the innovator in mobile OS I now see this innovation in Android and WP8.

It is quite correct that there needs to be a disruption every now and then I think that not Forstall is a disruptor but that the much needed disruption was in showing him the door.