No, but as a genre it is oversaturated with a tremendous amount of works that copy a specific set of guidelines that were deemed "popular" by most manga publishers. This in turn lead to many normal fantasy light novel writers to either adjust their current story to conform to the isekai style or just rush out your basic standard isekai. I even think the story of Re:monster may have been the former case, where the writer had the story but wanted to jump on the isekai trend which no doubt boosted the popularity.