I live in N Wales and those trail centers are rammed at the moment. I’ve been mtb’ing for 25 years and have never seen it so busy.
I did visit Afan in the summer of 2020, it was mid week though, and that was a bit quieter.
That said, I do believe the younger generation coming through are more into enduro and ebikes, which does tend to draw them away from trail centers and more towards off piste riding, bike parks or ‘cheeky’ ebiking up somewhere you wouldn’t consider (as much) with a normal bike.
I know a few 20-25yo who are buying ebikes over a normal bike. It will be interesting to see where XC Racing goes in the future.