If U.S. is no longer the world reserve currency, and if we can no longer sell Treasuries, we won’t be able to do that. They can only turn the U.S. dollar printing presses up from “super high speed” to “warp speed”, which will make the implosion almost instantaneous at that point. I don’t think there will be any more road to kick the can down at that point.
Fortunately for us there are very few currencies that can compete with ours. That has a little bit to do with our ability to weather the storm; I agree with Walker that we cannot keep doing this forever though.