Yes, we have decades between (direct involvement in) wars!!
We didn’t even spend actual money on war stuff the last few decades.
But we sure are gonna do it now, we need to protect our drinking water (for the coming water wars) and update our firewalls (for the coming Skynet wars).
Knowing humans: build additional ones, but also keep these ones working past their eol date, after all, the short-term financial side effects of destroying all the things are negligible, and the profits huuuge.