Well, I think the point is that vector graphics one way or another will soon be implemented into all browsers. It's just that IE happens to be the most widely used and VML is supported now
rather than waiting years.
As far as not including the 10%, I'm sure NS and Opera users are now quite used to sites made for IE not displaying or even functioning properly in their browsers.
I've just made some really wild crazy stuff with VML...It rocks! The future is now! Oh yeah...sorry...You can't see them...heh heh