Anyone who was at the game in 1977 will tell you there was genuine reason for a delay, around 38,000 gate, mostly paying at the turnstile with a huge away following for a night match.
OK both teams did stop playing with 10 minutes to go, but here is the reality check;
1. Sunderland were not relegated because of that match, they were relegated because they were shit all season.
2. It was in Sunderland's hands to win and stay up that night. They didn't because they were shit.
Moral of the story: Shit happens get on with it