It was previously reported that the decision to have Roman Reigns and Brock Lesnar win in their respective matches cleanly at No Mercy was to make them look strong toward their clash at WrestleMania 34. At this point, it has become very clear that that is the direction that WWE wants to take. The main event for WrestleMania 34 will be a match between Roman Reigns and Brock Lesnar with Reigns pinning Lesnar to become The New Universal Champion and WWE’s top star.
The plan for WWE right now is to keep both Roman Reigns and Brock Lesnar in a holding pattern of sorts until around Royal Rumble, at which time the program between the two will start to be heavily focused on. In the meantime, the plan right now is for Lesnar to disappear for a few months and for Reigns to get involved in a Shield reunion storyline.
Source: Wrestling Observer Newsletter