If you had a form of money with zero terminal energy leakage, then you would increase your purchasing power, by holding that money, in line with the advancements of technology and global productivity rates. Bitcoin is engineered in such a way that it will eventually draw in the economic energy of all other store of wealth assets. Rewarding the savers who have already chosen to save in Bitcoin.
These advancements that Bitcoin has on gold do not make gold worthless. In the same way that silver is notworthless despite its drawbacks to gold. Only, the holders of silver over time have lost economic energy to the holders of gold for the reasons discussed above. The holders of gold will in turn lose their economic energy, over time, to the holders of Bitcoin.