Content providers already have to support browsers that don't include h.264, and Chrome users are now in the same boat as Firefox users -- which content providers certainly won't ignore.

For sites which only produce h.264, Chrome includes Flash which can play h.264. And every video site is going to support a Flash playback path for older browsers.

The real impact here is pretty small, other than legitimizing a free and open codec. Chrome has just moved from one must-support category to another one. Most people will never notice the difference. How is that a loss?