I'd say there's a combination of factors, the first (and most important) being that Google is good enough for most people. This is actually why I think it's im

I'd say there's a combination of factors, the first (and most important) being that Google is good enough for most people. This is actually why I think it's important to have a good open source alternative. Google is good today. And frankly, if Bing wasn't around, Google could probably stop doing any work on search for the next five years with impunity.