But US are still tied there and they still fail to pivot to Asia.
Look at US Navy for example: first actual items of pivot to Asia, hyperzumwalts, are only entering service; most important single item - Constellations, won't come for years and has already failed.
By contrast, USN still adds LCS ships which are largely irrelevant for Westpac.
Basically, Iran tied US attention and inertia for long enough to let PLAN emerge as a peer. And with some luck, should we find that Iranians took June lessons to heart, US won't be able to extricate themselves out, but will get stuck deeper instead.
I.e. Iran for US is that hinge they are just stuck on. Pivoting and pivoting for a whole decade.