What If WWE WrestleMania Was Always 2 Nights?
30. WrestleMania 6

As the main event of WrestleMania VI features both the WWF Championship and Intercontinental Championship up for grabs, that rules out the second-tier title from headlining the first night, so we'd have to look elsewhere.
Funny enough, this card also features the Million Dollar Championship on the line, and with no slouches competing for it, either. Ted DiBiase and Jake "The Snake" Roberts are among the perennial go-to names to bring up when discussing wrestlers who arguably should have been a World champion, but never won the top title. This still wouldn't make up for that, but they could at least say they fought in a WrestleMania main event for a belt that was created as an alternative to the World title. That's something, right?!
Demolition beating The Colossal Connection for the tag titles is another possible option, but as mentioned before, two singles stars works for a better main event and marquee than a tag team match, and as popular as Demolition and Haku were, even with Andre the Giant in the mix, that quartet fighting over the Tag Team Championship isn't as appealing as DiBiase and Roberts battling for the flashy new title.