Its hard to know if there are "more of them" because we didn't have social media to tell us how many there were in the 80s. Also, statistically speaking, there are more people today than there was in the 80s and 90s when metal was very popular, so its almost unavoidable that there would be. However, this statement means little unless you balance it as a ratio vs the current population.There has never been more rock bands, especially heavy/extreme rock which tends to gravitate to big head gear with colored sound, with more income streams available to them, than today.
Rock & metal are hotter than ever.
Logic.
"Hotter" is relative. The underground scene is pretty big, but mainstream visibility is in the toilet. Younger audiences like my teen age kids think metal is for "old people." Real instruments sound dated to them. The metal category of the Grammys doesn't even get air time anymore.
Gatekeeper @$$ hats that trash any band that makes money (Slipknot, Mastodon, Ghost, etc) don't help. They steer the overall scene away from accessibility (which equals money) into weird little niches.
Rock\Metal also broke and there is no pot of gold at the end of the "hard work" rainbow anymore. Why do you think so many people are quitting mid-level touring bands. There's no money. No money, no future. People are motivated by profits. I can't tell you how many classic metal bands have made statements saying how it is nearly impossible for young bands to make a living at music any more.
I appreciate your enthusiasm. You're wearing rose tinted glasses though.