You could ask this question with almost any other uchiha.
He would be low kage at best
Did you see what Madara did to the shinobi alliance while only using his sharingan once? I don't mean the filler did you read the chapter?
Itachi trained in developing his Sharingan and mastering it to it's fullest.
If he never had Sharingan, he would have developed a completely different skill set, assuming he still has the intellect and talent he was born with.
If he didn't had visual power, he would concentrate on some other OP jutsus, he was genius after all.
I said almost. Now please find where I said "You can ask the same question for Madara."
Itachis jot even low kage with sharingan.
There is no such thing as Itachi without sharigan.