I think the mixed reaction to Tooth Fairy and especially Bride shows what a bad idea this is. Look at my NPS ranking of the houses, or just look at the wait times. A lot of fans rejected both as "been there, done that." The dada-esque nature of HHN has always been one of its top, unspoken selling points. Haunted Mansion has sat there for 50 years--as an HHN guest, you are one of the lucky few to experience 10 E-tickets that will cease to exist forever come November. @LuckyPlanet nailed it:
It also doesn't help that we just had a UCM house in 2019 and fairy tale/folklore houses haven't been noteworthy in years. Part of HHN's rotational appeal comes from different subjects being represented, and too much of one idea will have an impact on similar houses in back to back years or even every other year. Bride's been experiencing a bit of a wait time resurgence the past couple weeks, but Tooth Fairy usually remains deserted compared to the other houses. Not to start 2022 spec a day early, but I doubt HHN will be touching ideas related to these two houses anytime over the next couple years.