The beauty is that they want to play. As Yehudi menuin said, all the teaching in the world is meaningless, the wish, the enjoyment has to be there - everything else will follow.
How I wish I had followed my Grandmother's wish to play the violin. She sorta killed it by claiming they were Stradavarius. Experts told us they were victorian copies and that such copies were common enough for the 1850's (or what ever decade he said).
But would I still be a folkie after learning violin?
I would like to think so but I dunno.