#3 To build up the Usos again
It's well-documented news that the Revival are on their way out of the company. Hence, WWE left no stone unturned to make them a comic-relief team and booked them in ridiculous segments, and the Usos were dragged down with them as well. They were no longer the serious tag team that was the backbone of SmackDown's tag team division and were relegated to childish backstage pranks.
The Revival might be leaving the company, but the Usos are here to stay. Hence, it would be necessary for WWE to rectify their mistakes, and build the Usos back again. A mini-feud for the SmackDown's tag titles would be a better way to refresh the audience's memory.
The Usos have to build the tag division of RAW along with the current NXT tag champions Viking Raiders. That means they also have to get back on top and up their game again.