Kinberg downs the idea of a X-Men and Fantastic Four shared universe

The X-Men writer, Simon Kinberg has said that it would be "complicated" to place the upcoming Fantastic Four  film in the same universe as the X-Men  films. This idea of a shared universe is incorporated into the Marvel Studios team of films and TV series, with the Avengers living alongside the Agents of S.H.I.E.L.D and soon Daredevil living in the same time as the Guardians of the Galaxy. It is known that even DC's new film, so far known as either Man of Steel 2,  or, Batman vs Superman, is to create its own film universe for the characters. So, with the other companies striving to bring lives together in the form of separate movies, then a combination film; is it really that difficult for Fox to realize that the Fantastic Four could us friends like the X-Men in order to reclaim popularity after the disappointment of Fantastic Four: Rise of the Silver Surfer?