Alot of the younger crowd only knows the spray and pray method of an AR-15 or a semi auto handgun.
And herein is the problem - typically most in this 'crowd' did not grow up in a shooting/hunting/outdoors family and to them these guns are 'tactical' , for defense only, SHTF scenarios and several other phantasmagorical situations.
Their only guidance has been AR15.com, 'black gun' manufacturing websites & cheap bulk ammo
As far as those of us who shoot BP I suspect the greater number of us grew up in an outdoors environment and got into into BP as an extension of our interest in shooting, the tradition and history of the early mountain men & women and ultimately for some transitioning into BP hunting - but doing so with traditional BP rifles (as I did - I don't even regard inlines as 'muzzleloaders')
I know some very 'hard core' traditionalists - some having been long time participants in 'rendezvous' and other gatherings and the one thing they say is the numbers are dropping every year. Even in Oregon some of the BP activities that were once popular have very few members anymore or have ceased completely - and there are very few (nearly no) new getting involved.
Good luck bringing new people into BP as I just don't think the level of 'traditional' thinking, or the interest and respect for history exists anymore.
However as a testament to MY dedication the attached video is the first shot after I laboriously restored a Thompson/Center .54 Cal Renegade last year that was given to me and had suffered tremendous neglect. A lot of hard work brought it back to probably 90% condition and I'll let the video speak for itself...