#2. Great - Setting up a rivalry against a debuting star

Wouldn't it be great if WWE used RAW to promote a feud for SmackDown? Sure, from a logical standpoint, it doesn't really make sense to cross-promote rivalries between RAW and SmackDown Live.
Also read: 5 ways Brock Lesnar's return will negatively affect WWE
Did you know a top WWE Superstar just wrestled outside the company? More details HERE
However, it's something that they haven't really done very often. When was the last time a feud began between SmackDown stars on RAW and poured over to the blue brand? (or vice versa, for that matter).
It would be something unique and a great way of going about things. Roman Reigns feuding with a newly debuting superstar would certainly be good, but it's obviously unlikely, especially since Roman Reigns is already feuding against Elias on SmackDown and is set to face him at the MITB PPV.
Either way, it would be nice if WWE surprised us with a debut while Roman Reigns is out, rather than promoting something that people don't want to see.