I think it's a little too late, as Microsoft and Yahoo already have an alliance, and I don't see Microsoft allowing that to happen or to be under Google
These are all rumors. Yahoo has joined hands with Bing. Anyways, google is in no need to buy yahoo. Also anti-trust law wont permit them to buy yahoo. Google itself is very well established in search engine market.
What would it cost people to check reality before they call it reality check. Everything is possible in a world that's ruled by money. Governments making rules against businesses that roll in that kind of money. which is more scary. The governments or Business. Google is already trendsetter and monopolist on many levels. This will happen trough a backdoor. Stop them by not using their service might work