So it sounds like Canonical is putting users first, which strikes me as a very good policy in the long-term, if they want to grow the user base.
I always wondered if Canonical would run into issues around Firefox trademarks. I know that Mozilla policy is sensitive with regards to what things downstream can change and still use the Firefox trademark. In particular they want to make sure that downstream vendors are not shipping buggy features and tarnishing the Firefox brand. I would expect that shipping a Firefox derivative that did not default to the Google search engine would not make Mozilla (or Google) happy. This is why I was so surprised when Canonical first announced the change to Yahoo.