They would if they noticed it.
The overall rule change should be- Once a ball is over the wall, the act of rounding the bases for the hitter and other runners is just ceremonial.
Runners could have missed bases or passed each other, umpires don’t need to stick around on game ending homers to see if the bags and plate are touched.
If they can skip throwing pitches on an intentional walk, this is a rule that can be changed too.