One thing that nobody has mentioned is how much the OGC needed KML standardization. KML originates from 100,000 different domains? I don't know how many domains provide WxS, but I'll eat my keyboard if it's 10,000. I'm guessing it's closer to 1000.
Previously, you didn't know about the OGC unless you were near the SDI scene. This raises its profile by several orders of magnitude.