I think "changing enthusiasts" was the wrong phrase, I think it's more it has created a new breed of enthusiast.
Many of these "new gen" enthusiasts aren't really enthusiasts, either. Basically they got into TPW before theme parks, so it's more of a TPW/vlog enthusiasm than it is parks and coasters. Some of the UK park-based vlogs ironically feature like zero shots of any coasters or rides, it's all just ugly mugs and terrible cringeworthy banter. Once again, not that arsed about the rides or parks, or even looking to improve their filmmaking/editing skills. Just wanna blab on for an hour and get subscribers.
It's hilarious how most of them use the exact same phrases and similar vlogging styles to TPW as well. If you're gonna vlog, at least be creative, right?