I think the value of bitcoin will soar high because of the law of supply and demand. If the demand is high by that time since all bitcoins were already mined, its become more and more valuable.
A nice thread by the way! I have also thought about it once or twice. If all bitcoins are mined that means no more bitcoins are available to be possessed until or unless we buy it from someone else. There can be many consequences, the value will definitely shoot up but everyone will have his own value. Bitcoins is not controlled by anyone so there is actually no policy formulated for it that can cause chaos ultimately.