There is no such thing as superhero fatigue or Star Wars fatigue or X fatigue. It's all just excusing bad content. The drive to fill out the Disney+ catalog with a bunch of series where constant release was the main focus and not quality or coherent stories made people stop watching. It was also a mistake to make the series contain relevant events for the movies to build from as well, since once a series was missed you could be out of the loop on key details for the next movie, but if there actually was widespread positive reception of all these shows it wouldn't be a major issue.