The thing is...it was Google that had the idea. They way they built the search engine is absolutely brilliant. It will take a lot of money to both top it and get people to switch to it. I would hope they don't...they control enough as is. And besides, I'm all for new companies coming in that get to high places simply because of their innovation...
One other thing about Google is its simplicity. Microsoft, in nearly everything else they have done, has failed to be such. I don't know if they will manage to make this any different...