I hope we're not losing serious, long time builders to the kit world. We did lose Mr. Kibler, himself, as I understand he hasn't been building for a while now. His custom work is amazing!
The good kits are a certainly a boon to the sport, and were needed for quite some time. You can end up with a very nice gun for a very reasonable price. A price that fills that gap between what used to be the mainstream kits, and a custom gun.
I build Southern guns from a blank, so at first I was intimidated by the Kibler kits. Robots are making guns with inletting as good as my own... or almost. But I have also found that there will always be a market for handmade flintlocks. I have ancestors on both sides, who were early American farmers, settlers, and pioneers. They used handmade flintlocks (probably smoothbores); so for me as a reenactor, a handmade arm is important, as it is to many in the sport.
There's a big difference between a kit gun, and an arm built from a blank, using as many handmade parts as possible, and using more traditional methods of building. You can see the difference; and you can feel it when handling the gun. You have a truly one of a kind gun, wherein the gun, and all its' parts, reflect the design and execution of the craftsman.
People are where they are. My older brother still uses the Thompson Center (not) Hawken that I sold to him 48 years ago. He's taken several deer with it; and it's the only black powder gun he'll ever own. Most people, I think, will be satisfied with a well assembled and finished kit gun. Any gun, when used, becomes personal to the owner... even if it does look like everyone else's. Many, many years ago, I assembled a CVA Mountain rifle (made in the USA). It's the last percussion long arm I've owned... but it was a good shooter, and fun... and I often wish I had it back.
But there will always be those who recognize, and value, the intrinsic beauty of a well made custom gun. And some of those will love it enough that the'll want to carry on the traditions of hand building.
Hundreds of measurements. Thousands of decisions. Thousands of passes with the plane, rasp, and file. Hands performing tasks as the mind and eyes direct them to. At every turn lies the chance for success or failure. And when the result is a well designed and executed gun, it has a beauty that cannot be had from any kit gun. Fore me one of the challenges is to come as close to perfection as my human-ness will allow.
I've gotta say, though... I get a kick out of people putting together the new kits, and calling it a "build". It plays right to the ego, doesn't it. What do they actually build? Then again, there are those who would say I assemble guns, because I don't make my own barrels and locks. (I also by screws, bolts, and finishing supplies). I had to replace my bandsaw this past week. The whole thing came in three boxes. I opened the boxes, and assembled it... so do I get to tell everyone that I "built" my bandsaw?
My two cents.