To me, the US isn't just a geographic boundary. It's not even a collection of people. It's primarily the Constitution, and the limited government that flows from it.
If in 2029 we have a Constitution that is still theoretically in force, but in practice is ignored by the government, does the US still exist, or not? To me, even if something with that name exists, it's not the same US that existed in November 2024.
So I think that, if you're going to do this bet, you have to define the boundary conditions very carefully. Something with the "US" name will most likely exist in 2029. But will it be a zombie, or will it still be the same entity as it was before? And if it's a zombie, which of you wins the bet?