After this war, USA will be scared to death in case of any conflict with China or Russia. Americans will try to avoid it at any cost.
Iran has been under draconian sanctions for almost 47 years. Whatever Iran possesses is domestically made with help of a few countries. Smaller economy hence smaller military infrastructures.
On the other hand, China or Russia possess cutting edge technologies such as 5th generation fighter jets or heavy nuclear warheads, not to mention that both these countries are producers and pioneers of new military technologies.
As a consequence of Ramadan war with Iran, USA turned into 'just an other country' from an 'undisputed world power aka policeman of the globe'.