Trump won 30 states outright. If the members of the Electoral College changed their votes to put Hilary in, the voters in those 30 states would be disenfranchised. In other words, the election would have been stolen from them. Plus I doubt if Hillary would ever go along with it. Plus, it would start a shooting war.
Yep - this is it right here. As shady as she is I doubt even Hillary would accept the presidency on these terms.