#3 Giving Strowman a chance to turn heel
It is really hard for a big man to be a babyface, in my opinion. Maybe it would have been possible back in the day when the 'staged' element of pro wrestling wasn't public, but not anymore.
While Rollins and Strowman could always battle each other as two babyfaces, it is very clear that this is not a direction that Vince McMahon necessarily likes. WWE has often been described in the interviews I've conducted as a battle between 'good and bad', and I can definitely see a heel turn from Braun Strowman coming our way.
In fact, the title change may make the heel turn even more effective. We all remember the heel turn from Dean Ambrose shortly after Rollins and he won the titles, on the same night that Roman Reigns announced that he was going away to battle a real-life opponent.
Let's hope this heel turn is better than the Ambrose one turned out to be!