[alien_]

The Webkit/Blink engine is far from being single vendor, they are vibrant open source projects with many companies that contribute to the development efforts, pretty much all browsers except for Firefox will be based on it soon.

Web developers would rather have a single good engine, assuming that it's good enough and continuously developed.

IE failed back when they all but ceased development for a number of years and since it was closed source nobody could take it over.