To each his own. No. I don't think the traditional muzzleloader is fading away. As a matter of fact, the number of skilled rifle makers is at an all time high and is increasing steadily. Check out the Contempoary Longrifle Association, www.longrifle.ws
. Even one of the high end manufacturers of inline muzzleloaders, Austin & Halleck, now offers two very nice traditional models.
It is also incorrect to label traditional muzzleloaders as "unreliable". Our Civil War was fought with cap lock muzzleloaders in all kinds of weather conditions. Terrible carnage was wrought in places like Shiloh during constant rainstorms.
It's just my opinion, but I think many hunters select "modern" muzzleloaders simply because they are inexpensive, and have the general appearance of rifles that they are accustomed to.
This appearance can be decieving. I recently set up a CVA muzzleloader for a friend. It has a breech plug that in my opinion has a very long - too long - flash hole, and there is a special tool to to remove it and replace it, which must be done every time you shoot and clean the rifle. You also need to have special high tech grease to put on the threads before you reinstall the breech plug. Another special tool is required to place the 209 shotshell primer in place, and to remove it after firing. This requires some dexterity and would be difficult in low light conditions. This 50 caliber rifle has a 1 in 28 twist, which makes it unsuitable for patched round balls. lead conicals like Lyman's "shocker" can be used, however it is really designed for jacketed bullets in plastic sabots, which requires cleaning the barrel between shots.
It is also a good idea to check with your state's laws. Your modern muzzleloader may not be legal where you hunt. For example, Colorado allows "inline" muzzleloaders, but they cannot have a scope, must use loose powder, projectiles cannot be more than twice as long as the diameter, and sabots are not permitted.
I hunt with a custom "Kentucky" flintlock. My 50 caliber RB has no difficulty in putting a deer down. I can reload in less than a minute and can shoot many times before cleaning the barrel. I never have to remove the breech plug and my "tools" are simple, and carried in a leather "possibles" bag slung over my shoulder. I've never had so much fun in hunting.