So what's wrong with the "top 15" rule? You spend a year racing in the B's, show you are willing to make the commitment, and then get upgraded to the A's. If you upgrade to Cat 2 on the road, you get your ticket to the As sooner.
Why doesn't anyone want to work and prove themselves? By putting in the commitment, you show that you're really ready to upgrade, and that you might not get shelled in every A race you enter.
Does anyone think that DZ and Levi were never 3's? They paid their dues, won races, and got upgrades just like everyone else.I remember DZ winning High Uintas as a 3, solo by 30 minutes, and Levi going to to Casper and kicking Cat 3 butt. You couldn't hold them back if you tried. I don't see that Connor, Chase, or Tanner have been hamstrung by overly conservative upgrade policies. What I see is these talented juniors making the break in the A's at RMR.
This conversation isn't about talented juniors being held back, it's about spoiled masters racers who want the fast guys banned on the weekend, but want to ride with them at the RMR to "get better training". You can't please everyone, but at least you can make a level playing field and attempt to make the category system a meritocracy.
There is currently a pretty good system in place. Really, there are race opportunities for riders of every level, and a relatively clear policy for moving up through the Categories. Quit your bitching and ride your bike more.