I don't know. We already heard Disney say they wanted to do 2-3 per year, including some spin-off movies. I can't imagine how they would do a Yoda movie, but if they think it will make money, then...
But yes, this would be the among the dumbest ideas ever, along with Yaddle, midichlorians, Boba Fett as a kid, and cg clone troopers.