We'd love to drop the canvas2D renderer, but I really doubt we'd be able to for the foreseeable future. Old desktop machines with crappy drivers still get canvas2D, and although the percentage will be decreasing over time, it will probably be a couple of years before it's a non-issue. And then IE9 and IE10 would still need to die, which takes excruciatingly long with IE's release cycle.
I'll take another look sometime, maybe I can get it working anyway.
remember iOs, which supports canvas2d is "a little" big:
<img src="http://www.asymco.com/wp-content/uploads/2012/11/Screen-Shot-2012-11-26-at-11-26-10.11.11-AM.png" border="0" />