It is certainly possible. It would not be the first time we have lines of dialogue that at first seemed innocuous and turn out to “mean something.” And it could be that this is at least intended to hint at this possibility. At the same time, the Fantastic four The film is several years away and there is no indication that the script is in the works. While there may already be some ideas within Marvel Studios regarding how the first family of comics will join the MCU, it seems more likely that these decisions have yet to be made. Otherwise, this dialogue may mean less than it seems. Although, someone writing the new movie could certainly use these lines as part of the Fantastic four back story if they wanted.