The worst thing that is in my mind is that there are no more miners and probably there will be no more bitcoin transaction validators because they are no longer getting the new bitcoins they get as their wages, maybe they will stop being interested in bitcoins? I personally what scenario will be carried out in the future and what will it be like if a maximum of bitcoins is already on the market, but to reach 21 million coins it takes tens of years that maybe we can speculate at that time and we cannot predict that era with the thoughts we have have now.