ok, then, why do you think Google is by far Nr 1? Just "because"?
I happen to think that they sit on an immense pool of collected data, out of which they are able to fish what the user is looking for, despite the fact that a lot of rubbish also exists in that pool, and is returned in the serps along with the useful information.
Their pond has fish. A lot of it. Bing's pond does not. Just try an obscure specialized search, and Bing returns close to nothing. Not even rubbish, literally nothing. Not only do they have a long way to go, but they are not even considering the Google route to success (costs billions). Bing? not in a million years.
The web marketplace at present is not in equilibrium, and this, as is always the case, will eventually change. There *will* be equilibrium eventually. However, the Google monster will not be brought down by Bing. It will be brought down by circumstances that are not known at this time, and at a future point in time which is also unknown today. In short, today we do not know "how" and "when" but we know for sure it will happen. It's a matter of time, but don't hold your breath.