I agree that Google will dominate. There is a little doubt though. Microsoft within few years has taken a large pie of games market. Halo3 made more then 300 million of sales within one week. According to these stats, I believe Microsoft share will increase in search engine market as they go along
I think there is no room for any other search engines. There is a reason for this which I have got form the post. Microsoft is focusing on Games rather than search engine because they know that it is difficult to compete Google in Search Engine technology. On the other hand Google is working extensively on Searches so they will be far ahead from any other giant in this technology.