There's nothing wrong with trying something different, to get away from the status quo. In fact, that's what's desperately needed in this country, shaking things up a bit, getting away from the Democratic (Clinton) and Republican (Bush) oligarchies that have been controlling our country for the past 3 or 4 decades.
But Trump is NOT the person to entrust the country to. He has a long and proven track record of failure. The rhetoric, bigotry and misogynistic comments he's made throughout the course of his campaign have been despicable at best. There's every reason to believe that he would be the worst embarrassment of a President that we've ever had, and that he could potentially destroy our foreign relations far worse than Obama has (and he's set the bar pretty low).
Change is good, provided that it's not Trump.