After heavy consideration, the best course of action for the Universal title is for Goldberg to win and vacate the title.
Goldberg losing to Brock at Mania really makes no sense in this Old Man Berg Storyline unless they could really tear the house down with an epic match as Goldberg goes down as he has some heroic last stand. We know that's not possible.
This whole fantasy warfare goes real, Real live superhero, and being Brock's kryptonite would just be a sour ending to a really good story(It's really the only aspect of this feud that has been any good to be honest) if it ended with Brock winning a garbage match.
But I can see when Goldberg hype really blew up at Survivor Series. It was all about short-term revenue to building up as a Mania Main Event and has nothing to Goldberg's story. Build up hype and quickly cash in on it. Even though, WWE has fallen ass-backwards into making it a really good personal journey on it's own. Goldberg's best storyline in his own career.