The price of Bitcoin might go high depending on its demand since the supply will end after all has been mined. But the good news is that Bitcoin can be bought in bits, so it will still be available to buy some. Just like other scarce commodities people will still want to sell their Bitcoin at a given period so there will always be market liquidity. That is why we are encouraged to have a long term plan for our Bitcoin hodling because the time will come when common men will find it difficult to hold a significant amount. Don't always rush to sell all your hodling if you don't necessarily have need for the money, always plan for the future.