I’m going to give you a contrarian viewpoint I guess.
In a world where Bitcoin replaces all other currencies what do the businesses receive in exchange for the goods and services they provide? Obviously Bitcoin. What will they pay their dividends in. Obviously Bitcoin. The equities you are buying through your 401k are stakes in companies. Businesses aren’t going to disappear just because the dollar does. Businesses existed before dollars and before any fiat, before gold. Entrepreneurship is as fundamental as hey I think we can use this trap I made to get more buffalo meat and hey I will trade you my buffalo meat for those fine shoes you made. When you buy equities you are buying shares of companies, shares of businesses. Today they return dollars because that is what they collect but you believe in Bitcoin they will one day return to you Bitcoin. Future Bitcoin that you get because one day long before you exchanged fiat for a share of the business.