Take the C from him and see how he reacts. If he doesn't respond to that then we are screwed for years with that contract.
I don't think that's a bad idea, but probably for an entirely different reason than you. When we stripped Vinny of his captaincy he said that took a huge load off of his chest and he was able to let loose and perform better. A lot of people point towards the leg injuries Stamkos suffered as what has been holding him back, but lest we forget, that is also when he became captain. His mistakes are by and large mental. Will never happen, but I'd prefer a guy like Girardi or Callahan be the captain in the interim. Sometimes younger guys don't react well to the captaincy.