I think it *could* be a good thing, but that will depend on a lot of things going right, and I'd probably lay my $50 on my idea of "good" being literally the opposite of that of his supporters.
But indirectly, it may have good indirect benefits. I'll try to be brief, for a change, but:
1. Trump's victory is a huge blow to an establishment that has probably got too powerful, too complacent, and too detached from the people. I don't think Trump is the right answer himself, but perhaps it will take someone so extreme as he has been to provoke the needed change in attitudes.
2. Trump's victory is a wake-up call, if any more were needed, to anyone on my side of politics that we may need to reframe our arguments or just sell them better. To be honest I'd got this after Brexit, but anyone who missed that memo should have got this one. How to respond I don't know yet -- but clearly, those who lost on Tuesday have to think again.
3. Trump's victory is a blow to the Republican Party itself, who may have won across the board on Tuesday but remains bitterly divided. Again, it will be forced to sort itself out one way or another.
4. Trump's victory is yet another demonstration that the US electoral college is broken and in need of reform. I hope people wake up, take notice, and start to campaign properly for a fairer election system. The US has way too many elections anyway, so they may as well get the most important one right.
5. Depending on how his term of office goes, Trump's victory may also end up being a blow to those who voted for him. It's perhaps too early to tell, but signs are that he has already back-pedalled significantly on his campaign rhetoric. No more "Clinton is the devil/ belongs in jail/ founder of ISIS", but praising her service to the country and speaking of the debt America owes her. The pledge to ban all Muslims from entering the country has vanished from his website. This seems to me to suggest that Trump may well tone down his approach to the office proper. If so, one wonders what the point of electing him was for all those people who voted for a man seemingly determined to destroy the system, not uphold and work with it. I think they'll feel let down. It's even money whether they lash out again, or realise that their anger must be tempered by reality, but maybe a sedate Trump presidency would expose how shallow that sort of rhetoric really is once and for all.
Well, I can only hope. How I'd respond to a Trump presidency that matches what his campaign was like, I don't know. No matter how it turns out, though, it's hard to see things staying the same after this.