Trump is guilty of just one thing... ignorance. He is deeply ignorant about politics, the world, humanity, philosophy and real values, which means even about life itself. He basically caricatures everything and uses constant hyperbole as a cover for this deep ignorance. As far as I can see he has near-zero understanding at the philosophical level.
And yet this is precisely what makes him valuable to us.
The current system of neoliberal cronyism has transformed America, and to a smaller extent the EU also, into one of the worst versions of itself. The America that existed in and right after WWII has been entirely changed. Many things came together to achieve this change, but regardless it has happened. The US is essentially its own worst enemy, and many people around the world no longer see the US as a sign of freedom, hope, justice, rationality; they see it as a sign of warfare and death, hypocrisy, and shameless exploitative capitalism.
Hillary will continue the trend that we are on. She is a part of the neoliberal system and has nothing to gain by upending it, even if she could or wanted to, which she couldn't and doesn't. US influence is already under fire because of these contradictions and hypocrisies, which really rose to the fore under Nixon, Reagan, Bush 1 and 2, Clinton and Obama. Each of these presidents expanded the neoliberal contradiction that is eating away at the heart of American and the ideals it used to stand for (rationality, equality, tolerance, freedom, justice, and human genius and greatness). These are each philosophical values; America may only have stood for some of these implicitly and still with many faults and contradictions, but nonetheless it stood for them, or rather they were historically instantiated within it.
Now the much larger contradiction of modern-day America has essentially wiped out much of those past gains. The people and the values are still here, the ground level hasn't really changed that much at all in America, but the overt level of values, power, structural forms has changed; the image that is presented to the world, the actions, the rhetoric, and the loss of will to truth, all of this is what the rest of humanity sees when it looks at America. Yes it is still visible to see the good, truth-reflecting parts too, but those are increasingly pushed to the side.
So, can Trump do something about this? I would think that is deep ignorance is his virtue here. He has some very simply ideas about how to fix things, and unfortunately he has been brainwashed for many years by extreme right-wing talk radio, but other than this I think he could really do some positive changes. For one thing he would seemingly not have the will to continue the imperialism, but new economic arrangements would be needed, and I think he is enough of an instinctual businessman to find them. He might not seek out the necessities that will force that instinctive potency to bear, but I think those necessities will become apparent on their own. He might also not want to continue colonialism and warfare in the Middle East, which will cause the ME to blow up even more initially but this is just an expression of latent contradictions inherent to the ME. The western world divided up the ME after WWII in such a way that these contradictions must be realized, either now or later.
But Trump is also a wild card, we cannot really know exactly what he will do. So it comes down to a question of betting on the wild card you can't be sure of, or giving in and accepting the same problems and deterioration that have been ongoing for so many decades. But don't get me wrong, I am not a cynic here, I think there has been a lot of progress made over those decades and America is not in some kind of seriously dire straights, and I would first make the argument that the GOP is the real enemy that threatens to bring down America (through their deeply ideological and false moralizing natures, paranoias, obstructionism in politics, mudding the waters, cronyism, disbelief in the positive value of governance, etc.); but that this point, I am starting to see things as from the perspective of a non-American looking at the US from outside. There are still many great things about the US, but I wonder what it must look like from the outside?
If there is, say, a 25% chance Trump is for real and could really bring some sanity and earth-groundedness back to America then I would take that over a 100% chance that Hillary will continue business as usual (the for-profit war machine).