That's nothing and no problems is facing still now. We know that Bing has the background of the Microsoft so it seems very had to beat the Bing in technology and if Yahoo and Bing is playing simultaneously then I am sure results would be better then it was ever before.
It motivated me to try and make more use of Yahoo/Bing. When Google was 65% of the market and Yahoo/Bing 15% each, it made more sense to optimize for Google rather than separately optimize for two sites each with 15% of the market. Now they're 30% of the market, you can't ignore them.