This is a misconception, and honestly it's hubris talking. The US has already burned through a big chunk of its key munitions. More than half of its THAAD interceptors, about a quarter of its Patriot stock, roughly 1,000 total with limited yearly production, and a serious slice of Tomahawks, some of which will take years to replace.

Even with ramp ups, you are looking at 3 to 4 years before extra production actually shows up. And for the really constrained systems like GBU-57, cruise missiles tied to Williams engines, or anything needing Chinese gallium, even that timeline is probably optimistic if China keeps export controls in place.

And this constant comparison to Iraq or Afghanistan just does not hold up. Those were wars where the US could sit in safe zones and strike from distance. A Taiwan scenario is completely different. It is right on China’s doorstep, against a peer the US has never actually faced at this scale. Even the USSR was not comparable in terms of economic integration or industrial strength.

edit:

If the ceasefire collapses this Wednesday as Trump has signaled, these numbers will start moving again, and the replacement time estimates will only get worse because the industrial base hasn't yet begun delivering against any of the surge contracts