This is exactly the reason we started PlayCanvas [http://playcanvas.com]. I don't think it will be long before there is a modern browser in every TV, phone and tablet, in addition to every desktop machine.
We love how easy it is to get a sample/demo/game published using PlayCanvas, we use it _all_ the time. We offer the option to download your game export and host it yourself but it's one button to publish to PlayCanvas so we're sure most people will want to do that.