I think the most optimistic outcome for Bitcoin would be to return to its roots, which is to play to the nature of bitcoin as a currency, as the opposite of global fiat currencies, coexisting with global fiat currencies and ready to replace the declining credit of fiat currencies, such as overissued US dollars.
Return to its roots? I mean Bitcoin is still being used alternatively for payments these days. I am not sure how it was purely used back then, but I do not think that we would still describe the adoption of Bitcoin as "returning to its roots". It is already a tree and it gave a seed to a lot of coins in the crypto market, but many of them turned out to be just a wilted ones. 