After that precious metals will go into a terminal decline and eventually be basically worthless other than industrial and jewelry demand.
Base use for gold might be as plain metal, rare because its only made in supernovas but all the same available in quantities suitable for electronics and jewellery even. The reason its used for money over thousands of years is because it never degrades or changes, its perfectly divisible and ideal for trade and storing of wealth.
I think its arrogant to believe we have altered a trend that has been in existence that long. Maybe it'll be a great thing when it does happen, perhaps free energy will mean gold is a pointless weight from then on. Bitcoin is a technology while great its not replacing the idea and worth of gold, it may be more convenient but its not a replacement for golds unique qualities as an element.
I totally love technology have done for decades, great growth is possible and its amazing but in this case it has not made traditional stores of value redundant. If gold didnt exist, I'd argue the case for other commodities to exist in their long term worth. Less tradable perhaps as qualities vary but still we haven't altered gold as a metal placed within an economy so a great decline I find especially unlikely.
You entirely do not understand what Bitcoin was created for. It will end up kicking all the non-$billionaires off-chain. Bitcoin is to be the world's NWO reserve currency.
My personal take on capitalism is that its a bottom up system, with growth primarily occurring with the smallest entities. The current world system does favour the very largest organisations with a great bias and the world is worse off for it. If Bitcoin is to do well it'll likely come via enabling the most remote unadvantaged participants in an economy.
Its no insult to say bitcoin is for the smallest trades, its really a great accomplishment if it can do this. Thats the heart of what a bit is referring to imo and I hope BTC never loses focus to become just a hedge fund ticket. Besides anything else we already have lots of speculative assets to bet on, BTC should be high utility and the worth really is by accident derived because people keep around those bits in their pocket even when their poor. Theres a billion poor so get the market cap in essense for the most unlikely poorest traders