No way Google will shut down it's services in China... It's millions of dollars loss and they have around 30-40 percent search market share. From business point of view it's a foolish thing to do when everything is going on track.
It could get some extra traffic...but I don`t think it will help too much. Google will surely remain number 1.
The last I heard Google was going to be pulling out of china sometime in the beginning of April. There is no official word though so its hard to say. As far as bing goes, I don't see a major difference. There also yahoo search too...
Yahoo is 4th or 5th in ranking, Bing is still below the top search engines, Google will never lose it's place as number one, Even though bing is getting heavily populated google has been around for a lot longer than bing, Google has more features and reputation as well, I see a future for bing if its developed and offer services like google. But aside from that google will always remain #1 in traffic rank.
No. Yahoo is second. I assume you mean "used". Bing had market share up to 12% at one time last year. It's now down to 3-5%.
That is because Baidu claimed it's a Chinese company although it was registered outside China and abroad shareholders acquired over 50% of its share. And many Chinese pple, fool as they were, would believe that Baidu is a Chinese company, whatever Baidu does, they 'love' it.