By itself that coins which aren't used actively or not supported by goods will leave gradually a turn. They will subside in purses in the form of ancient relics reminding of swindlers or unsuccessful projects.
I think not all coins will survive,some of them survive because of there nice and costly projects so it will survive and as long as the manager will not surrender on the projects it have and their is still people trust on it projects,it will still ok and it will improve until it will become successful projects and for those coins didn't survive its because of the handler of the coins that surrender immediately even losing profit.