Already this might have discussed. The growth of bitcoin as well other digital currencies keeps progressing with time. By the time common people too have begun to use cryptocurrencies on their daily life. Compared to the fiat usage, common people using cryptocurrencies were low. When the usage increases what will be the preference of common people. Whether it gets used as investment, gambling asset, trading asset, alternate payment, darkweb usage source.
All those you mentioned will be used by some investor but it is just depend on the investor itself. I get used to use bitcoin as an investment place because it is really promising although the common people think bitcoin is dangerous place to store their money. And also I use bitcoin gambling tool especially I'm playing dice thus far and sometime I use bitcoin as trading place. But I believe most people who have bitcoin will be use as an investment only. Although their countries is trying to accept cryptocurrency as payment system but I doubt most of them will use it as daily payment system.