I'm not saying this is my actual prediction, but I'm going the conspiracy theory route. This probably isn't true, but for the fun of it I'll throw this in. Vince killed himself. The reason there was the Appreciation Day was to make the people that hated him look like bad people. When he walked to the ring, he walked with an empty, depressed look. Backstage, he was confused to where he was going, thinking about his decision. Once he walked outside, he still looked upset and was still thinking if it was the right thing for him. He took one last look back and walked into the highway to hell.