1. honestly i feel like it wasn't- taking "Nuh uh" seriously in any capacity is kinda... eh? but I do agree lets just forget about now
2. I doubt they'll add them- this is the Mario bros. not anyone else, besides they would most likely be like luigi- based upon mario with different stats and quirks (which for Wario and Waluigi wouldn't fit well imo) either way I don't think they'll be any major updates anymore really- the ownership change was in order to maintain the mod, and as I see it- the mod is basically complete and there really isn't anything that could be added aside from stuff from Wonder- I think the Wario.. Bros.? are more deserving of there own mod/mod pack- seeing as they could play a lot differently and be there own thing without needing to be related to this mod.
that being said if you want wario there is always the JeckJim models and its wario replacement model and voice clips if you wanna check that out?