for what? a smaller deficit? it's unclear whether reducing the size of the defense industry helps the US economy, so maybe you get a smaller deficit but you also raise unemployment by a couple % and lower economic growth by a % or so over the next 25 years
conversely, it's pretty clear this does hurt its current hegemonic position. that's a gamble not many are willing to take so carelessly
I say this as a non-American, by the way