How sure are you with this statement? A cashless society will increase the demand for cryptocurrencies like bitcoin. This cannot kill bitcoin, it will boost its usage.own As long as there will be improvements, the introduction of the second layer protocol (lightning network) for bitcoin's blockchain is the possible relief for the current problem.
US Dollar, UK pound, Gold and Silver have seen World War 2 and 2 nuclear bombs dropped on Japan that killed 200,000 people because Japan had 80,000 suicide pilots ready to crash planes of American warships.