They don't plan to shut you up. Not beyond a certain point. At this point the disillusioned white mongrels of the alt right (they were never the top-shelf genetic stock--that's why they throw their lot in with race & country in [current year]) are useful idiots for the establishment. They need a bogeyman to point at, an impotent and slovenly coterie of largely useless and economically impoverished white men to serve as the supposed 'MAGA hordes' that are apparently ready to descend on civilized America as soon as Trump activates his 'sleeper cell networks.' It's a fiction and the alt right is part of it. Honestly, the establishment created the alt right. They directed its evolution towards further-right nationalism (a far cry from Milo's original vision) as much as possible, so their bogeyman creation would resemble most closely the convenient characterization that they wanted it to posses. There are of course people within the alt right that keep their focus and try to incline others to do the same, but I imagine that those few luminaries are disillusioned at this point. When your movement is so... dull!... then the proof is in the pudding. It isn't going anywhere unless it is commanded to go there by the same folk it claims to oppose.

Aka... the alt right is a bunch of lethargic white guys who never fulfilled their (frequently impressive) potential and live off of dreams of some revolution that will never come.