@khird yea i figured some of these concerns,.. the bigger issue for me is once you learn dvorak anytime you are away from your home keyboard youll have to use qwerty and now likely going to make a lot of mistakes as you fight muscle memory... to me thats the biggest deterrant.
I did see a cool keyboard once where the keys were little LCD screens so the key mappings would show up dynamically as the kayboard switches... cool idea but doesnt really fix the problem.