I believe that there are actually quite a few GOPe types that think exactly that.
If you look at this race as a battle between globalists and nationalists, with Trump being the only nationalist, it fits together great. The GOPe and the DEM parties, both globalists but of slightly different flavors, will unite in an effort to beat Trump. Beating Trump preserves status quo style of politics and governing (by the incompetent), and serves as an object lesson in "who's the boss" to the masses.