I think that is not true and that is just false news, this bitcoin will never disappear, bitcoin will probably disappear if humans have disappeared which means it is a doomsday, bitcoin will be a treasure that is very difficult to solve because the encryption of bitcoin is so powerful it won't be easy to disappear.
Yes just a false news those people keeps saying btc will disappear because of doesnt believe on the future of it. I believe btc will goes stay long and will do exists with users support throughout this year.