A Medici could hold a store of gold throughout their properties for the last 700 years and during that entire time, they can be a bank just on the fact that they can guarantee deposits against that wealth. At minimum they can ensure their wealth and that of their descendants, because gold has always been valuable. Even the communists hoarded gold - so much for building a currencyless society!

It is thus absurd to compare bitcoin to gold, yet. In 2000 years, if it's still around, I'm happy to accept the comparison.

I can find you people today that would take a gold coin for their services instead of a bitcoin (obviously worth far more), because they don't care / understand / trust it. The only reason I can think gold would no longer be valuable would also nullify the value of bitcoin - the demise of capitalism or anything like it, and the advent of a currencyless society.