We'll have to tell this story to our grandkids:
"Well children we almost did get the Fantastic Four in this glorious combined cinematic universe well call the MCU. The critics hated it and the general audience didn't want it, but alas all of those who rooted again this movie just had to see for themselves opening weekend, and it made enough to get a sequel and Fox has held on ever since.
In the end Fox wasn't our worst enemy, it was our own curiosity. We ourselves put to death the only chance of a complete MCU. MBJ was right. We saw it anyway..."
*cue thousand yard stare from the story teller and soft weeping from the children*