I know a good handful of people might not agree with this, but I feel like it has to be said. Why would you remove pretty much any intuitive to go out and find a woodland mansion? Worst of all, why wouldn't you use this opportunity to finally add illusioners to the main game? I just feel like Mojang really threw blindly at a dart board with this one. What do you think?
The Meaning of Life, the Universe, and Everything.
No support, unless Evoker drops were modified. Currently, Totems of Undying are just plain too rare for a single-use item.
That said, if some sort of Illager boss was added to Woodland Mansions (Such as a tweaked Illusioner), then they'd both avoid coming off as lackluster for endgame structures, and avoid making a single-use item hideously rare.