At this stage, Mania would draw well no matter how ice cold WWE gets. A 100,000 seater like Dallas might be a stretch, but going to Wrestlemania is still a bucket list item for most wrestling fans and I'm pretty sure they'll get 50-60,000 no matter what the company poops out.
Also I think Wrestle Kingdom *could* have been a fair comparison. Running a socially distanced show in a city as large and densely populated as Tokyo could have been seen as proof running a open stadium show could be done safely....had Vince's BFF done even the bare minimum to try to contain things. Even Alanis Morisette would have to apricate that irony.
Did anyone else see were Roman said he wanted to face the Rock at WM 39 in LA? Seems like it would be the logical end game of the Tribal Chief gimmick, and it would be one Official Wrestlemania Moment that wouldn't get changed at the last second. Hell, if they kick it off at the Raw after Mania this year it could get the Hogan -Savage year long build and be the mega event they could use to fill out a monster stadium like Dallas legit (or as legit as WWE sellouts get).