#3 It frees up Baron Corbin and Bobby Roode
The feud between Baron Corbin and Bobby Roode seems to be in its infancy, which means that they now have more options going forward now that Corbin is no longer the United States champion.
Sure it's likely that Corbin will invoke his rematch clause, but I fully expect Ziggler will retain and Corbin and Roode will go on to continue their animosity towards each other in the ring. This will also give SmackDown LIVE more options in general as they will be able to introduce new Superstars into the mid-card title picture.
Edited by anirudh.b