Cash is certainly necessary in the whole society, but as you say our money is always devaluating, it is believed that the encrypted currency will soon take over the model, and at least many people know that the money can be kept in the bitcoin.
Well, we cannot say if cryptocurrency will be taking over or not, but one certain thing for sure is that, as things are going economically, the possibility of seeing more attention being paid to digital currency is huge. By the way, the topic and discussion is economically related and not all about cash.
In most developed countries, as well as most business men and institutional investors, the use of cryptocurrency to store up value may actually be the case for a lot of them. The good thing is that the crypto space will obviously grow to that effect.