Bitcoin is the best investment today but I doubt that bitcoin will become the best asset in the world in the future. The world's best assets must meet factors such as liquidity, legality, stability and safety against geopolitical and economic risks...The most important thing is the use case, the real world application, as this is the main factor driving demand, not just depending on limited supply to be the best asset.
Over time, bitcoin will mature and be able to overcome its shortcomings such as high volatility, increase liquidity, and become globally legal or stable during times of instability...making it a good inflation hedge comparable to gold, TIPS. But its application and use in as many diverse areas as gold is difficult and that makes me doubt that it will ever be the best asset.
Bitcoin silences the term the best asset with the meaning of having liquidity, legality, stability, and security of geopolitical and economic risks as you mentioned. If it is not possible at this time Bitcoin never reached the highest value and something that is considered the best must have a fantasis value regardless of whether the asset is quite fluctuating or not. If the supply is abundant and never limited, maybe Bitcoin will never be worthless even though other factors also influence the pricelessness of Bitcoin's formation into one of the best and in my opinion the supply is also quite decisive.
When the price of Bitcoin stabilizes then Bitcoin will not be as valuable as it is now and I don't think that will ever happen. When all Bitcoins are mined, what happens is scarcity and in conditions like this Bitcoin will become more expensive because people will tend to hold it rather than trade it.