#1 The match would be wasted with a predictable outcome
Seth Rollins has just defeated Brock Lesnar at WrestleMania 35. Rollins' first Universal title defense will be at Money in the Bank 2019 against AJ Styles. WWE will not be keen on taking the title off the Architect so soon, especially since RAW has only two major babyfaces, and both of them are going against each other at Money in the Bank.
The night would not end with AJ Styles winning the title. That one thing is certain. This is the primordial reason why WWE should have pulled the trigger on this rivalry once Seth Rollins had some successful title defenses under his belt.
That way the clash would become a bit more unpredictable and the WWE Universe would be a bit more invested in this rivalry.
Currently, the only thing that could alter the result is the Money in the Bank briefcase.