A Trump nomination would be the end of the GOP as we know it (Matthew Continetti) from the Washington Free Beacon
"Whether Trump wins or loses a general election against Hillary Clinton is less important in this analysis than the effect his nomination would have on the composition and philosophy of the Republican Party. That effect would be profound. Political parties are not static. They are born, they grow and change, they shrink and die. ... Homegrown terrorism, demographic panic, racial tension, income stagnation, and Trump’s persona may catalyze a political realignment along the lines we have seen before in our politics and see currently in Europe’s. Have conservatives and Republicans thought through what would happen next? What choices we might have to make? Or are we too afraid to acknowledge the possibility that the movement and party to which we belong is no longer our own?"