#2 Want to see - Seth Rollins wins the men's Royal Rumble and challenges Brock Lesnar at WrestleMania 35 for Universal Championship

As you already know, these two men have already faced each other in the past a few times. And now for one more time, Seth Rollins could possibly face Lesnar for Universal Championship real soon.
Rollins is the current number one favorite to win this year's men's Royal Rumble match and face Brock Lesnar in the main event of WrestleMania 35.
Look who just shut down all of Tony Khan's critics! More HERE.
Therefore, Rollins winning this year's Rumble is one of those things that we all want to see, more than anything else.
#1 Don't want to - The Rock returns and win the men's Royal Rumble and challenges Brock Lesnar at WrestleMania 35 for Universal Championship

The Rock is ranked in current top-five favorites to win this year's Men's Royal Rumble match. Also, last year it was rumored that The Rock is in talks with WWE to return at the end of this month and to win the Royal Rumble match and go on to face Brock Lesnar for one more time.
Also Read: 5 Surprising WWE Rumors from this week you need to know (January 16th, 2019)
Though a matchup between "The Great One" and "The Beast Incarnate" sounds great, we are in the new-era now this match no longer seems to be one of those matches fans will ask for.
Therefore, if The Rock returns and wins the men's Rumble match, it'll bring several other superstars to the limelight, which isn't a thing we want to see.