You are right, we invest in Bitcoin for one purpose only, profit, and once we have enough profit, we will convert it into fiat and other assets. No one uses it for its original purpose, how can we expect it to replace banks one day?
Literally how nobody taught 15 years ago that Bitcoin would be a major conversation in the white house today. Technology and humans evolves, if you don't think that banks are threatened by Bitcoin, I do. If not they wouldn't have been against Bitcoin in the first place. With the growth of lightening network, and merchants implementing Bitcoin payment systems like in El Salvador, the journey flows along that way till everyone begin to understand how it works. Centralization won't leave, yes, but Bitcoin has already handed us a visible alternative to all the ill treatments the banking system gave to customers.