Bitcoin can't be collapsed even though they was no miners that is currently mining bitcoin, the reasons been that bitcoin revolve or recycled at the holders custody, because bitcoin doesn't have a consumption the way I see bitcoin from the beginning, only thing that we use bitcoin to do is to hold bitcoin for long-term, the amount of Bitcoin mined from the time bitcoin was introduced is still evokes, only thing that I know that can affects bitcoin is the population size of people who demands for it,

But in actual circumstances I believe that bitcoin can never be that scarce if miners refused to mine bitcoin, and if they stop mining holders will release the amounts of bitcoin they're holding for period of time, and if they release their bitcoin they will be a circulation in bit coin