They'll try to make sure that doesn't happen by trying to find a way to compel the offensive but interesting to somehow stick around. They've already done it with other private industries like healthcare and requiring you to buy in or face penalties so there's a precedent.
And it might be the same platforms too. Facebook, reddit, google, twitter have been around for more than a decade now and have been shown to have a lot of staying power.
Nonetheless remember that graphic?
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Normies will monopolize a culture or group, claim it as theirs or that they are "actual" examples of what it means to be in that culture or group, then once the culture or group is dead they'll leave for another host. They'll mimic the outcasts while shaming them and pretending they can do better and claiming the outcast's culture as their own in the mean time.