The web's usability peaked in like 2005, where there was enough javascript to run gmail, but anything more complicated lived in a little flash player box, and I had click-to-activate enabled so ads and tracking scripts couldn't do anything.
I hope they keep adding things like the element until websites can do all the website things without javascript, and we somehow get back to a flash/applet style box for complex stuff (with a more reasonable security model, hell it's fine if javascript is what lives in the box).