Well there's one thing about Trump winning the presidency that I think will benefit the nation in the long run: The divisive ugliness he exploited during his campaign had the haters crawling out from under the stones they were hiding under in order to support their Enabler in Chief, and once again, take their "rightful place" as the champions and true representatives of the Caucasian demographic in the US.
Trump's campaign rhetoric gave the haters a nation-wide voice that they were without for quite a few years. They've given Trump's divisive rhetoric their seal of approval and have taken it as a sign that their voice has legitimacy and popular support once again.
That Trump has brought this out is good in the sense that it makes everyone else aware that this hatred is still with us, it still has a support base, and all it would take is a legitimate national leader like Trump to further fan the flames like he has and have it spread. So we now have another chance to tramp this hatred back down so that it's expansion won't hit critical mass and become what most of the nation thought would never rear its ugly head again.
Trump appealing to nativism, nationalism and "traditionalism" and exploiting those factors as tools to win him his presidency and to further his personal self-interested agenda is threatening the unity we share as fellow Americans and the security this unity provides. Our enemies see this weakness, this exploitable feature of our lack of common cause and its a sure bet that they're already taking advantage of it through Trump and his notorious weaknesses.
One could assume that Trump is the type of person who will overreact to any perceived threat as a way of compensating for his weaknesses and fear of failure, and I'm familiar with this condition observing this quite often in the workplace and in the military, especially among newly hired supervisory types that simply react reflexively in this way because of a lack of confidence and experience, two very important factors that Trump, IMO, is now exhibiting.
Those old hands in this game of worldwide power politics can easily see these weaknesses in Trump because Trump had already exposed himself and his habits all through his life in the public eye.
What frightens me is what I'm seeing in the people Trump is surrounding himself with via his cabinet selections. They are a manifestation of Trump's reflexive need to overreact and he's doing just that by placing over-reactive overly aggressive people in positions of great power.
He is further compressing an already severely compacted powder keg of tenuous relationships between world leaders.
I can't say what the end result of his actions are, other than to say that folks like him that had the opportunity to attain low level supervisory positions never made it into higher management on character alone. They needed to resort to other unsavory means to get ahead, and some of them, like Trump, got really really good at it.