The power of 3D is fantastic and although sharing 3D in portals is the future there are still legal obligations that mean we need to prepare drawings/maps. Preparing building specific drawings in 3D would be aided greatly by 3D Map Series and Page Driven Data.
It'd be great to show a 3D building from 4 different cameras/views/perspectives. You can currently fake this behaviour by including a 5th map window, to a 2D map and then link the viewports. It's clunky but functional.
It'd be great if 3D scenes could be map series though.