I'm inclined to agree. Part of my thought process is just the extent to which the world economy is interconnected. Already, just from how important Iran's positioning is in that, there could be major economic fallout as a result of sustained war in the region (like relating to oil). Opening up more fronts in a haphazard way would be over before it begins because of how it would wreck supply chains and the US, the one that is most likely to be aggressor in those fronts, is one of the more vulnerable to those supply chain issues because of how much it financialized its economy.

I don't think Trump and his admin actually wanted sustained war. I think they wanted smash and grab intimidation like Venezuela, but they picked the wrong country to fuck with this time and the empire is not what it once was to be able to go all out. Trump loves pretending like he's a peacemaker and prides himself on being a dealmaker as well (his "art of the deal" crap). Being the source of another world war is the opposite of that.

But the US admin is also in deep by now and too prideful to cower, so of course they're going to beat the drums about how ready they are to war and how strong they are.