Is there any word on whether other browsers will be implementing this in the future? It's what's keeping me from using canvas today, and partially what's keeping me from writing a certain app I've been thinking about for a little while.
Have you played with SVG?
What were your issues?
As for feature completeness I agree with you. The Firefox SVG team is very small and not funded by the Mozilla corporation (at least that was the case last year when I talked to one of its members) - the SVG standard, on the other hand, is HUGE.