I think the era of cash (paper money) is gradually diminishing as many people turn towards digital currency or even transferring through electronic means. If we read about the recent reports that the fiat devaluation is actually caused by the excessive number of paper money printed not to talk of the expensive amount spend on the printing process this cash, this has actually prompted the government to promote the method of cashless policy which has brought about the creation of fintechs. This factors have had an impact of cash been used less. But I don’t think that total cash less policy can be achieved sooner or later because there are rural areas that still the basic network service to run this cashless policy. Also the transaction fees and sometimes the slow payment process during transaction is a thing that would still make it hard to get away from using cash.

Yes bitcoin is already an alternative because many people run both inter or intra border transactions using the bitcoin. Because aside the slow transaction process and the high transactions fees it so much more secure than the even the fiat transfers.