Yes.
I see the possibility of the following scenario.
1. China calls in our debt.
2. We cannot pay. This weakens our country even more economically and we are financially wiped out. We cannot get money from anywhere and other countries who are experiencing their own economic catastrophes will not help us or cannot help us.
3. In such a weakened US position, China then invades Taiwan giving no warning.
I see this one too. If we lose reserve currency status - it’ll happen.