The only thing that stops bitcoin to be accepted as a reserve currency is the central bankers.
I`m 100% sure that bitcoin will be a better reserve currency than the USD,euro or any other national currency.Anyway,your theory is somehow wrong.I wouldn`t compare bitcoin with a real estate property or common goods.I don`t think that all the physical assets are centralized.You own them after you buy them.
Yes after you buy you own them, but for example you buy gold, can you move it easy? No, they have laws and if you want to take out from your country they put controls and limit you, same happen with fiat and well they can always create a new law or modify the existants.
If you buy a house, because you are owner you have to pay a tax, they decide how much, and next year they change the amount you have to pay as they wish... if you wanna sell any physical assets you have to follow they rules and laws even they are completley ridiculous some of them.
Bitcoin it is not easy to control as the other assets we can own, of course they can add license and control since you want to exchange it for traditional assets.