This is magical thinking. The bonds are actually held by investors, and when investors see them as a losing bet, they will stop buying them. Unless you think American taxpayers will suddenly be willing to live within our means, it’s a real problem.
The current reserve currency status means that people often use the bonds for reasons other than returns, but we need to not fool ourselves into assuming this paradigm is permanent. Once real inflation gets going, it’s just a coordination problem to change the reserve instrument. After that, the intersection between what the US can feasibly return and what investors require can quickly evaporate.
We are currently on a Japanese trajectory, but that could easily become Argentina.