Google most likely wouldn't have bought Motorola if there weren't this patent war, which makes it clear that this acquisition is mainly for patents.
And the Android vendors should be pretty happy about this deal, as Google hasn't washed its hands off of them.
The hardware business that comes with this acquisition is a bonus. Of course google would try to make money out of it, since they aren't running a charity. They say even in that case, they will be fair to other OEMs. There is no reason not to believe it.