The thing is, the IP has lost its value to the event by being featured every single year, making it kind of stale. The first couple of houses they did were a big deal, and had a lot of work and dedication put in to execute them well. Over the last few years, each successive house feels like it has had less effort put into it than the last, and they don't seem to have gotten a big response from the general audience. I think most perceive them to be an obligatory IP filler spot at this point.
Even if next year is not the time that we go without a Universal Monsters house, it will have to eventually take a break like Walking Dead before it. Taking two or three years off from Universal Monsters, and then coming back with a phenomenal house is the best thing they could do to reinvigorate interest. There does not need to be a Monsters house every single year, and the event has shown in the past that it can be successful without that IP being featured all the time.