Any asset backed by faith fails when faith is gone. The PTB have been controlling faith for thousands of years. Thinking that crypto is beyond their reach is the ultimate naivety. They own all the money in the world (literally, its theirs). They use the crypto market as a pump and dump for stock market manipulation. It's all theirs.

Having said that, I think that crypto absolutely will be the currency of the future, but not one backed by faith. At some point we will have the infrastructure for asset backed cryptocurrencies. There are fledgling companies that provide such a system with limited exchange now (like Kinesis). Stocks are an obvious path to create an asset backed crypto. The stock market will almost certainly become a crypto market in the not too distant future. Gamestop is already showing the way, though it hasn't yet gone full "stocks as crypto" yet.

At some point the system of fiat currency will fail completely. Once the game is fully exposed, and people really understand what it is, and what it's for, no one will want anything to do with it. The entire crypto market could easily crash completely before that reveal (it is owned by the PTB despite everyone's protest that it is beyond their reach), but even if it survives to the Fiatpocalypse, it won't last past it.

All of the crypto's in use today (except those few backed by an asset) are not assets. It can't be stated more simply than that. Btc et al is not an asset. It has no value except what other people believe it does. Only real assets are reasonable long term investments. Anything else is just trading one fraud for another.