There’s a very specific reason the ending is done the way it is. If you listen to the lyrics, Harry and Niall start the song. They’re representing the fans. Listen to their lyrics. Then Louis and Liam represent One Direction. They’re telling the questioning fans not to worry because this is not the end. Therefore, at the end of the video, Niall and Harry exit one way together (the fans) and Liam and Louis exit the other way (1D). This represents the hiatus. The temporary parting of the fans and the boys. The break in and of itself. They don’t hug goodbye, they wave. Because it’s not goodbye, it’s see you later. I’d be willing to bet that when hiatus ends, they will do a video announcement for it and it’ll start with the blank brick wall background and then you’ll see Niall and Harry walk in from the left and Liam and Louis walk in from the right and boom there you have it. The fans and the boys reuniting. And then they will announce they’re going back on tour. You’re welcome.