#1 Heel turn and WrestleMania 35 singles match

This is a storyline that could eventually culminate at WrestleMania 35 with The Miz and Shane McMahon facing each other in a one-on-one match. Shane is a certainty at each and every WrestleMania, and WM35 later this year could see Shane in another singles match.
Shane and The Miz could go on a dream run, defeating all teams on SmackDown over the course of the next few weeks, but leading up to WrestleMania, a flurry of losses could cause the two to fallout.
Eventually, one of them turns heel, attacks the other and sets up a mouthwatering WrestleMania 35 match that will see the two pit each other, perhaps to see who really is the "best in the world".
The storyline could eventually go on till the Greatest Royal Rumble or Crown Jewel where Shane defends his World Cup title.