It will be great when support expands, but I don't see how those are really deal-breakers. Are there even any equivalent platforms that would suggest mobile and

It will be great when support expands, but I don't see how those are really deal-breakers. Are there even any equivalent platforms that would suggest mobile and IE support will be required before WebGL takes off? Meanwhile Firefox + Chrome is hundreds of millions of potential users. Yes, people will get confused and annoyed about why a game doesn't work in their browser of choice, because they don't really know what a browser is, or the difference between a mobile browser and a desktop browser. But that's no different than my mother wondering why her flash games don't work on her ipad, and flash games are still a substantial (if not always stable) market. The real problem holding back rapid progress, I think, is that lack of strong development tools, and that's (very slowly) being worked on.