Looking at the demos with Move it doesn't seem like much of a problem.
Either way I am not disagreeing with having extra devices that work with the creation process, but rather making Dreams themed peripherals. That is overly expensive and without any idea of how well Dreams is going to be received (if social media and online forums are an indication, the answer is not that well), it would just be a money sink to do so.
Making other devices compatible with Dreams creation is the most logical step, and infinitely cheaper and safer I feel.
I've been sharing Dreams-GIFs on the PS4 subreddit, and there's definitely a huge market for Dreams. My most viewed GIF got 9K upvotes (which is quite a lot on that sub). People seem to get absolutely excited for the game once they actually get what it's about. The beta will be a huge change in the game's perception and awareness.
Predicted 15+ million lifetime-sales for God of War: