As long as the world has centralized systems like the government that controls us, don't think bitcoin will replace and become the main monetary system of the world, what I think it will be is an alternative that will be good.
Bitcoin has done the impossible, so I wouldn't be surprised if it hits $100m in the future ($1 per satoshi) due to ever-increasing inflation rates. But I concur with you that BTC will never replace Fiat currencies because governments will not allow that to happen. They want control/power more than anything else. You can see why El Salvador hasn't ditched the USD completely even with recent legislation in favor of making BTC legal tender.
Without Fiat, I don't see how mainstream governments will survive. I'm fine with BTC as an alternative to Fiat as long as it remains decentralized and censorship-resistant. I'd suggest you keep buying and "hodling" BTC as the best is yet to come. Who knows if you'll become rich by the time BTC goes to Mars? Just my thoughts
Admittedly bitcoin has done what no other asset has, growing millions of times in just 13 years while still more than 90% of the world's population hasn't invested in it. I haven't thought about $100 million per bitcoin but if it hits $1 million, then I believe it will come to our generation.
We all wish bitcoin would replace the fiat system, but that is clearly very unlikely when the government is still the one controlling the world. Bitcoin fit is a more alternative, and that's what I expect to happen soon.