I did spot one guy on cantis, they caught him overshooting the corner at the bottom of the hill
you might find them on back on cantis when the mud appears, a lot including sven IIRC used discs at cross vegas and some of the faster drier courses last year
Sven Nys was actually swapping between bikes with discs and cantilevers in the same race last year. It's also possible manufacturers have stopped producing the top end frames with cantilever mounts.
I did spot one guy on cantis, they caught him overshooting the corner at the bottom of the hill
you might find them on back on cantis when the mud appears, a lot including sven IIRC used discs at cross vegas and some of the faster drier courses last year