Shooter,
Well, I'll disagree with you!
The WSU is set up so that in order to join them you have to form a club. The WSU League on the other hand allows anyone to shoot as long as they can get up a three man team. I doubt if 3/4ths the shooters are so affiliated. I doubt if they'd have 1/4th the teams shooting if they did as you suggested. Actually I'd say most are members of the ASSRA and not the WSU.
I'm not saying that ASSRA membership wouldn't be nice for everyone to have but then we run into the exclusionary question that has brought such an uproar on here in the past. I don't know if you've been on here long enuf to get a look at the "inclusive" vs "exclusive" threads we've had in the past, but believe me there are a LOT of opinions on that.
I'll even stick my neck out and say most of the people on here are not members of the ASSRA. If it was set up so that only ASSRA members could get on here, and it easily can, how many subscribers do you think we'd have? How many questions would go unanswered from lack of participation? I think I can say I know a bit about SS (Schuetzen) shooting but I can't answer 1/10th of the questions on here. But any that are asked seem to get some kind of answer.
I don't really have a dog in this since I've been a member of the ASSRA for quite a few years. I'm only looking at it from past experience in running these things, and my personal opinion is that the more you include the better the chance of succeeding. It might even encourage some to join.
You yourself, as a newbie to the game, are a beneficiary of these "Non" members. How long would you stay here if half/none of your questions were answered?