Its not fatigue. Its literally supply and demand. There are now half a dozen options from Disney alone, let alone the dozens more from not-Disney sources. Not to mention streaming increasing the options from "the handful of movies you bought physical copies of" to "literally almost anything."

People are still only going to take their kids out X times a year, and only are capable of spending Y amounts of money doing so. Adding incredible amounts of options divides that up regardless of quality.

If a phenomenal unoffensive movie came out it certainly would bring people out in droves, as Sonic and Mario did in the past few years, but even in Disney's prime their duds were still much more in demand due to the limited supply.