Had Fox moved forward with this movie featuring the X-Men, Fantastic Four, Deadpool and X-Men, this might have placed the Fox Marvel franchise on a higher pedestal. Granted, the X-Men film series has been chugging along steadily for nearly two decades, which includes the surprise success of Deadpool, but along with Daredevil barely getting a chance to shine, the Fantastic Four movies didn’t fare particularly well, with the 2015 reboot ending up a critical and commercial bomb.
Article source: https://www.cinemablend.com/news/2474240/fox-almost-made-a-marvel-crossover-movie-starring-the-x-men-fantastic-four-and-more