I don't really think the StageList is going to push Wario down. We can do really well in almost (if not all) stages.
Yes, there are some pretty stupid stages to play as Wario on like RC, Brinstar and Norfair, but I don't think this will affect his potential at all, Warios proved to do really great on the most conservative StageLists and on "inventive" ones. TBH I've been doing GREAT on any neutral stages, even the ones people hate to play on, like YI, PARTICULARLY. And I don't really felt prejuticated while playing on stages like Halberd, Castle Siege or Delphino, honestly I think they won't affect much any other characters and Wario is still all around on those If not pretty good
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I think this StageList will balance the starter stages influence on the set since some of our "neutral stages" are considered excelent counterpicks for some characters like, Snake/Marth on BF, ICs Diddy Falco on FD and Olimar on YI. The MLG decision was really scrupulously. This stage set tends to equiparate the strong difference that S and A Tier characters have compared to C, D, E and etc. tier characters, of course this difference will still remain a bit drastic but what lowering that difference it's what they are trying to do.