I'm betting it will be gimmicky, anticlimactic bullshit like inducting that first WM main event into the HOF.

Frankly, I'd rather see HBK’s Five Most Hilarious Bumps In That Summerslam Match Vs Hulk Hogan. That would at least be entertaining. Personally I’ve always felt like that first Mania main event was a bore.
If an early wrestler makes the hall for his pioneer status, I’m good with that. If we’re inducting matches, however…. I think it’s corny anyways, but if they’re going that route, the match needs to be fire on its own accord and establishes significant precedence and influence based on the merits of the match, not some arbitrary induction merely because it’s the first. So a clinic like Savage/Steamboat, for example, would be good. Austin/Hart at Mania 13. TLC at Mania 17. Hulk/Rock at Mania 18, even, despite not exactly being a technical clinic.