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.
That would require the majority of Bitcoin holders to refrain from speculative activity. If that happens Bitcoin could become a currency. Otherwise how do you see Bitcoin achieve sufficient stability in order to work as a currency as we know it?