My favourite ones that I can think of right off the bat, are
WL4 Parallel World
Ribbit the Deltarune mod
Earthbound Halloween Hack
And a lot of the Pizza Tower fan levels made with the cyop mod are really good too. A couple of them genuinely could pass as being official because they're just...
If they get the style right, Hell's yes! But I think if it's a 3D adventure game, it shouldn't be called Wario Land though, it should be Wario World 2 or a new name all together.
I think a Wario anime would be cooler.
A slice of life WarioWare anime would be damn funny. Or a Wario Land adventure anime would be solid too.
I'm not even a big anime person, but I'd watch the HELL out of a Wario one.