It might be nice some to have a true 4 door, but I highly doubt that Toyota would make a 4 door FJ that would basically be the same wheel base and have the same drive train as the 4 Runner. They wouldn't be much different except for looks and they could just make a lower level trim package on the 4Runner for a lot less money and just forget the FJ. As far as the 4Runner and Cherokee, yes they have more in common, but so does the FJ. If you look at it the Jeep is solid axle and the FJ, 4Runner, and Cherokee are all IFS. They only real thing the FJ and Jeep have in common is size over the others.