Probably, but I don't exclude bikepacking as a subset of touring. So I see less decline since I include bikepacking. I don't really see a clear dividing line between the two any way.
I don't know what to think about ebikes in the mix. Are folks actually ebike touring in any numbers at all?
FWIW, I ride my MTB daily on the trails, but haven't been on a tour in a while so I am a bit out of touch with what is going on in the touring world.