In your Superstars review you write “The winner of the match gets the title shot at the champion at Wrestlemania 9, thus beginning that tradition.”
Do you know if it was intended to be a tradition when they first brought it in, or did it just happen to work for what they're doing that year? And then, later on, they figured they'd stumbled on something good and turned it into a tradition?
That would be more or less what happened, yes. Just an easy booking crutch in a lot of ways.