Nobody really know! There is this quantum computer system coming on board and it said that it has serious capacity to decrypt many cryptocurrency and other computer system! We may actually have powerful computer that will necessitate another digital asset!
This thing has been discussed since long ago in this forum, if you are really interested to that topic just use the search engine and it seems that cryptocurrency will still requires more than a quantum super computer to decrypt.
As if someone has said, it requires all the resource this planet have just to decrypt bitcoin so pretty much not a threat for cryptocurrency, but wait until the quantum computer out I guess.