I suppose that is possible, and we will certainly see. I think a better strategy for Trump--if he really wants to crush the Democrats--would be to play spoiler. That is, he stays in the Republican race but makes it so another highly electable candidate is doing well as front runner or close second.
He lets the Democrats go hair-on-fire over his looking like he might get nominated and eggs them on to put on all sorts of (expensive) ad campaigns and such focused on keeping him from winning that nomination. Then he drops out at the last moment, the Democrats have spent gazillions on trying to stop him, when what he really accomplished was he kept the now Republican candidate shielded from all that bashing while costing the DNC a big chunk of its money on a chimera.