I hope that this wouldn't be a deterrent since the custom dance would be dancer-only and I also suspect it to be a lot of work to find the right animations that fluently follow up on each other. I think the dancing emotes would also be of better quality.

It would be tons of fun to find a few people willing to adjust custom songs and custom dances to be just perfect for each other. In my head this always was the true purpose of dancer anyways.