I don't think it's going to 0, but the word currency will eventually detach from crypto & BTC will become just a collectable asset.
Just stumbled on some old news from the UK, the interesting part is that UK retail traders can trade everything else, but not BTC, that's kinda ironic. FCA bans the sale of crypto-derivatives to retail consumers https://www.fca.org.uk/news/press-releases/fca-bans-sale-crypto-derivatives-retail-consumers