I have to say, one thing that get's me about the current speculating and hoping for another Wah rep is that so far, Wario is among the franchises where we really haven't seen much content in Ultimate so far. At the moment we know of:
-Wario himself, along with the return of the Shoulder Charge and visual tweaks to his down throw, both of which help to make Wario a little more reflective of Wario Land.
-Ashley is an Assist Trophy again.
-Both previous Wario stages are back.
And that's it. There's always the unfortunate chance that the series will get shafted in terms of content, but there is that part of me that hopes that soon enough we will see a trailer for Kat & Ana/Mona/9-Volt/Captain Syrup and that the lack of any new Wario content for so long, was just a build up for said trailer, where we also get a new remix and Assist Trophy.
A man can dream and hey, Nintendo just dropped the Jimmy character trailer and if we get one every two weeks like it was for the first two, then Gold will be pushed for quite a while.
Plus, there's a chance that the description for Master Mantis' B Rank card in Gold is a tease of a new WarioWare being in the works for the Switch:
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And if that's the case then a Wario newcomer in Smash would make for great advertising, especially since Nintendo is using the appeal of the Ware cast to promote Gold, with the character trailers.