I think this demographic is absolutely going to love the artist I have queued up. Lol.
I think we could largely joke about this with just about any subgenre, and we have been fine so far. I don't think it's a mystery just about all of us like mainstream rock, mostly from the 60s-90s. As you get farther from that core you are going to lose more and more drafters, that just the way it works. Prog, Metal, rap, country, reggae, international, on and on - there are going to be people who either don't listen to it or just flat out don't like it.
Like I said, I am diving into some newer metal next time around. I don't expect everybody to love it, but I am going to try my best to make a case for any type of music fan. I'm not doing Cannibal Corpse or anything ( @krista4 - I got your message and left them for you ) and I think if people got through and liked stuff like Clutch or harder AIC they will be able to get through at least 20 of these songs and the main core of my playlist.