Theoretically, in the next year or two, Mozilla, Opera, Konqueror and so on might offer complete support for CSS3. But we won’t be able to take advantage of it if 85% of the audience is using a browser that still has some problems with CSS1.
This is not a good thing. People have said that this means
[n]othing to web developers, and right now it doesn’t, but in one, two, three or even ten years time, when IE6 is still around because Windows XP will still be around (although in a small minority I’m hoping).