IMHO, in a Clinton v. Trump v. Rubio/Cruz: Clinton wins in a Reaganesuqe electoral landslide as Trump/RubioCruz splits the Repub votes and Clinton takes all expect for probably Texas.
We’ve already seen it before with Clinton, Perot and Bush with Clinton claiming all the electoral votes of Georgia with 43% of the vote. All of California’s electoral votes with 46% of the vote. etc.