I love how no one has discussed how if dino's can make rafts, how do they use them effectively? I doubt any large dinosaurs could use rafts nor could it be used to cross oceans. This leaves lots of large dinosaurs' habitats that are split by the atlantic ocean.
Also, just because something is feasible, doesn't mean we should accept it. There is substantial evidence for the movement of tectonic plates that has nothing to do with dinosaurs. As scientists, we accept the most complete theory until another more complete one comes along. This is feasible but is in conflict with the far more complete tectonic plate theory.
If you can reconcile all the evidence of the plates moving, then you might be on to something.