This is a huge win for Google. For a company that has near monopoly in search and online ad business to escape this is a big deal.
It's not like they've actually had a monopoly (90%) for almost 2 decades. Furthermore, it's not like you can't trivially change your search engine in the next 2 minutes.
Another way to measure market share is by counting incoming clicks to websites from search engines. By that measure, google's share is higher.
http://thenextweb.com/asia/2012/11/06/google-search-maps-con...
I bet Microsoft has a much more consistent desktop market share in more countries. That is, about 90% everywhere. And that's one monopoly that isn't going away any time soon.
What we don't want is high marketshare and high switching costs which reduce the incentive of a company to continue to innovate.