I don't think Reddit will go through a dramatic death as Digg did. Digg v4, as many old timers remember, happened in a different era with a different mix of users.

Reddit will slowly become what their management always wanted it to become: a bastard child of facebook. Some may stay because of habit, some simply won't care, it's all the casual crowd Spez is betting on.

That also means it will die a slow death where big flashy subs will be inundated with recycled memes and botspam despite the effort of some with good intentions that still hang into that platform.

If any those become disillusioned and look for another place, Lemmy/Kbin can become that second home.