@bescouted did point out its practical value tbh. I can see that the OP could have some point on cryptos infringing on the precious metal market. However, in my personal opinion, to deem them obsolete seem too hard to me. I think their long track-record and being something physical (with a practical use) will make them keep a good portion of their value as a medium on top of the direct industrial demand.
Should the world situation turn really ugly, physical preciouse metals is a safer than bet than also cryptos in my book. Guess it comes down to once faith in humanity, and knowlendge of history...