He gives a lot of political reasons for that, and I agree fully with them, but in the end the only thing that matters is the resulting product. Don't get me wrong, I am very thankful for what Mozilla did for the web at a time when IE was practically the only browser. And I also see that they continue innovate.

Mozilla can only survive if a sizable percentage of end users perceive Firefox as the best browser for them, and this usually means that Firefox needs to provide the best user experience. Personally I think that other browsers currently provide a better user experience, and I see a lot of people around me switching from FF to Chrome. The reason for that is not Webkit , but Firefox's user interface.