Stablecoins offer a relentless price insensitive buyer of US debt. This is good for America, good for democracy, and good for property rights globally.
However, stablecoins WILL cause unrest in Nigeria, Venezuela, Lebanon, and Turkey as their corrupt local currency completely erodes and the ruling class can no longer extract from their citizens.
Confidence in crypto will go poof when there's a big enough run that the measly 7 transactions per second can't keep up with demand. We just haven't seen a crypto bank run yet. The $100 / transaction is nothing compared to what it could be. When that happens "stable" coins will lose their stability and the smoke and mirrors behind audit-free coins will collapse. You couldn't pay me to hold crypto.