If they slapped the moniker ‘gravel’ onto it then it’d be fully subscribed I reckon.
There does seem to be a bit of a split in mountain biking IMO.
Some wanting more hardcore now do enduro.
Some wanting more big natural old school xc have gone to gravel.
And others who want longer rides like the marathon type but maybe with a wild camp have gone bike packing.
And I’ve not even mentioned e-bikes.
I think it’s quite an exciting time to be an off-road cyclist, but more choose does seem to reduce the numbers for each discipline.