Think about it: New director... which will bring a new and different look, pace and feel. Possibly even a slight re-model of the TF's themselves. Possibly even a new composer for the score. No Shia- so a new focus, with new and different direction. A great number of characters gone- so new characters. Sure, they might keep in the same "continuity", but it aint gonna be the same. Just look at the new POTC film: it's considered a "reboot".