We'll see how the trend moves going forward, but even after capturing (by rhetoric if not act) the white house, the alt-right continues to be a radical fringe, and suffers from serious internal contradictions that make any serious movement building doomed. The movement has attracted the attention of a lot of white nationalists, anti-semites and hardline fascists (amren, natall, kss), while also attracting a new wave of online-prominent trolls and shit-stirrers.
But what happens when the 4chan poster with the anime pillow who denies the holocaust just to get a rise out of the libcucks crosses paths with an actual hardline anti-semite who is interested in building an even-more-final solution?
To use a colloquialism, what happens when the rubber meets the road? Do the fascists tolerate what they would consider to be total degeneracy for the sake of finally building a mass movement? Does the online troll recognize that what was an ironic joke for him is a hard reality for others, and move to push their real-life activism away from those types of groups?
This is what I mean by internal contradictions, the kind that can kill a mass movement before it even starts.
So while there is a common refrain of "this is why Trump won, and the movement of contrarians, devils advocates, trolls, anti-pc crusaders, people who tweet about white genocide, stormfront regulars and conspiracy theorists is only going to grow if you being offensive towards them", the reality is much, much more complicated.
Trust in Trump has plummeted, even amongst his core. The vote is very quickly slipping out of the grasp of the Right, and was always a race against time demographically to begin with. And if you're in a position where you can't win through democratic means, you have to use other means (boycotts, protests, organizing, etc). And the alt-right is utterly lamed by it's own hand before that race has even started.