Hmm. While a reasonable theory, it's not likely to actually work. The problem is that, while a lightly trained dancer has some hope of correcting based on the music, a lightly trained musician is *very* unlikely to be able to make the same adjustment. Odd are that the dancers and the musicians would just keep going in separate directions. (It might work if the musicians know the dance well enough to figure out from the movement where they should be, but that didn't look like the case here.)

I agree that rehearsing together is important for really getting it right. This is one reason why the Waytes try to play at dance practice once a month -- it just feels different when you have real people dancing as you play...