All he ever offers are platitudes with no substance. While I don't agree with Hillary on anything I don't think Trump could best her on substance. She would constantly be able to use one phrase that would keep Trump perpetually in defense mode, "Remember when you said......*insert liberal positions here*"
Trump would have serious problems... He has created problems in a debate where you are right Clinton will just troll through...
But a bigger problem for trump is his history... He has a litany of beating up the little guys, being a bully. Clinton landry has been well aired and found wanting... There is no substance and eventually (after 6 weeks ) people as why are you talking about bullshit emails and not the economy. People start to ask what is your actual plan in details and that is when not only Trump has a problem but Cruz and Rubio have issues too... Cruz especially, he is hated even by his own side.