As I said in my comment and my post[4]: [even if they crash] stable coins are one of the major drivers of cryptocurrencies/blockchains and by definition fully collateralized stable coins does not crash or if they crash it is because the underlying standard financial system crashes.
I also highlight that in this context the most interesting thing about blockchains is that "Openness and interoperability have become more important than decentralization".
[4] The Rise of Stable Coins: Beyond Facebook Libra: https://www.linkedin.com/pulse/rise-stable-coins-beyond-face...