So what you're saying with that example is that even with the backing of many governments that have a vested interest in doing anything to stop the bubble from bursting (something Bitcoin doesn't have), the greater fool theory ultimately was correct in that eventually the bubble burst? (I don't agree that the USD-Gold peg was an example of greater fool theory, just an example of how pegging your currency to gold as a sovereign government with a central bank is not a reasonable way of doing monetary policy. The gold standard is an outlier in the human history of monetary policy, the only reason it's so notable to us today is because it was in use during the development of modern economics.)
Cryptocurrencies do not produce anything and any actual transactions done using them (as opposed to speculative trading) are a rounding error even after more than a decade. There is no mechanism for them to be anything other than a complicated greater fool scam because ultimately the only way you can make money from them is if you can sell them to someone else for more money than you bought them for -- which is what a greater fool scam is.
Cryptocurrencies do not produce anything and any actual transactions done using them (as opposed to speculative trading) are a rounding error even after more than a decade. There is no mechanism for them to be anything other than a complicated greater fool scam because ultimately the only way you can make money from them is if you can sell them to someone else for more money than you bought them for -- which is what a greater fool scam is.