(A respectfully offered counterpoint)
Welllll . . . I understand the sentiment, but from my point of view, what we do is well defined. We emphasize the cartridge rifles of the Victorian era. We cannot be all things to all people, tempting as that can be. How many classes does SASS have now? Somewhere North of 40 last I counted. We have our Niche, it is ours and no one else's.
BTW we already make allowances for C&B revolvers, one may carry and or stage as many charged revolvers as one wants, with capping done on the clock in liu of reloading.
There is another organization trying to get off the ground, the American Plainsmen. Their Niche is the Pre cartridge percussion era, with some overlap (Henrys and Spencers). I have no desire to walk on their field. They recently voted down an expansion to the rifles of 1873/4, so as not to further overlap with us.
The NSSA also has compititions for Percussion breachloaders as well. Various Muzzleloader groups do "Woods walk" scenarios, one of the inspirations for our own Skirmish Runs. Percussion breechloaders are welcome at these.
We do need to emphasize that our weapons compete only in class, and that the single shots are at no disadvantage to the later Repeaters. Frankly, I think the current surge in Smokeless repeaters is simply due to the fact that they are easier to obtain, and at lower prices than the earlier Single shots or their reproductions. An Historical oddity is that it is the earlier rifles that are being reproduced, at much higher cost than most available surplus repeaters. This includes Percussion breechloaders, on average rather more expensive than an M1898 infantry Krag, as an example.
I would see someone getting the relatively inexpensive repeater first, then later going deeper into the GAF with a single shot as a natural progression. Finaly learning to load Black Powder cartridges. This seems to be what is happening, and I keep careful watch on it.
IMHO please, have a cup of camp coffee on me!