Yeah, sure, it doesn't make much of a difference whether it is delisted or not. It could well remain there until the Switch's death, but then again, it shouldn't be an issue to delist a game they have said from start it would be temporary.
As for bad PR and delisting of Wii U games, I would say there's a bit of hipocrisy in most people pointing that out. It's not like there are that many people who will buy Pikmin 3 back on the Wii U. The Wii U user base is 5 times smaller than the Switch's and whoever wanted Pikmin 3 had 7 years to get this game and probably already got it. I own it, for example, and I never got the DLCs and I don't intend to. In other words, I doubt those critics will be getting the cheaper (but heftier in case they don't own a Wii U) version of the game now.