Unfortunately, I am inclined to agree that the Fantastic Four, while maintaining a loyal fan base are definitely not what I would consider to be popular characters at this point in time. Just looking at a lot of comments from Youtube videos that talk about the Disney/Fox merger, a lot of comments are "I don't really care about the Fantastic Four, but Doom and Silver Surfer are cool" or "The Fantastic Four are boring". People seem much more excited about the X-Men returning home than the F4.