I think that would be a precarious situation for Mozilla. Not to say the current situation is a good one. So I'm sure they're weighing this. But let's assume t

I think that would be a precarious situation for Mozilla. Not to say the current situation is a good one. So I'm sure they're weighing this. But let's assume they switch to Webkit. In itself that is a huge investment. Then either they track whatever Google wants to do with Webkit, or they fork. But once they fork, they're pretty much on their own again. So there was no gain. To profit from Google's dev, they have to track whatever Google does, and maintain patches for their own things that Google doesn't want to merge. In some important ways, they'd be dependent on Google. Their direct competitor.