[kbs666]

I think the concern is that the present users of RW are only those who do it themselves.

The crowd, which IME is the majority of GM's, who buy everything and simply run what they buy have no use for RW until they can buy modules and AP's in RW format so why would they even go to as RW seminar?

If you want a taste of the numbers difference go to the PFS ballroom or D&D AL hall at the next GenCon. Ask around in there. Many of those guys play nothing but the organized play campaign and even the ones who play outside of it still only play pre made stuff. The number of GM's who custom make their own worlds and adventures is really quite small.