I've been saying this since DKCR showed up NSMBWii nearly a decade ago.
NSMBU is just an abominably bland, lazy, unimaginative game. From its copy-paste assets and level themes, to its ear-bleeding music, its a showcase of how lazy Nintendo can be when they know they can get away with it. The fact its being sold again in 2019 for full price is just disgusting.
I guess in terms of fan reception and lasting impact, you may have a point.
But it's kinda hard to say "showed up" when the Metacritic scores are similar and the sales are...still in NSMBWii's advantage even without the bundles.
I get people have issue with the pricing (like they did with DKTF, Bayonetta 1 and 2, Pokken DX, among other Wii U ports). But if it sells, Nintendo will continue releasing those ports at full price. Of course, people will say its Mario so it'll sell well anyway when there have been examples that shows it's not always the case.