We will likely to see Bitcoin to be top world asset first, than top reserved currency.
Conversely, I think bitcoin will probably need to become a reserve asset or global currency before it can become the world's leading asset.
While bitcoin doesn't need government backing to exist, we can't deny that if the government doesn't legalize it and doesn't approve ETFs. I don't think traditional institutions, corporations or companies will invest billions of dollars in it and push bitcoin price above $100k that quickly. Therefore, for bitcoin to become the world's number 1 asset, it probably needs to gain the trust of central banks and be included in national reserves. At that point, the world's confidence in bitcoin will be almost as absolute as gold and it will have a chance to become the world's greatest asset.