but if it stagnates it won't be worth squat after a while.
That might be true (but some content remains valuable after long periods of time too, think of all the good stories and classics from the turn of the 19th century for example), but even so, for those who are able it might be better to move the content now and delay even that much to reddit. (Not everyone can do this, and even for those that do it's extra effort, unfortunately.)