Seth being injured is sad and all, but don't forget the golden opportunity in front of them. Joe is loved by smarks and could easily be hated the casual fan for injuring Rollins. Plus, HHH did hire Joe to hurt Seth in Kayfabe, and Joe did injure Seth (even though by accident) in one attack. They could use this accident to monster push Joe as a true destroyer.
Realistically, he's just do something stupid like Andre the Giant battle royal or nothing at all as "punishment", but this guy is a vet who's proven that he can shine in the spotlight, even though he's had two slip ups. Who knows, if they use him right, they could have Goldberg beat Lesnar at Wrestlemania again (because really, what even is the point of giving Lesnar his win back) and then have Joe beat him. Yeah, I may sound like I'm talking out of my ass, but hey, they just lost a main eventer, might as well make another, then have him be Seth's return fued