One of the news posts said they were already looking into an afk kick timer, but first they are adding hardware to make the game accessible to more people. It's already been considered but is on the back burner for server upgrades at the moment.

Kicking inactive players is an obvious part of the solution that they said they'd look into. Why they aren't in a hurry to implement it I can't imagine to know. If they aren't in a hurry to add an idle timer then they sure aren't going to add timers and notifications to restrict the play time of everyone for a temporary fix, which I believe is far worse idea because of the aforementioned reasons.