IF there were a S4, and I don't believe there will be, but if there is, it'd be like 3-4 years down the road probably. The Return was announced in 2014, and Frost/Lynch would have already had some/most of it written by then in order to get the order from Showtime. So I think it'd be at least 2020.
But I just don't see it happening. It's all over in 6 days, so let's all enjoy it!
Well, I know the cast and at least one of the Rancho Rosa producers would love to do more. So I really do think it'll come down to if David does. I doubt it'd happen any other way. They'll either have an idea to continue it, or they won't.
Right from the beginning of this, that's how they always talked about it. In a 'never say never' kind of way, and it seems like Lynch had a good time making it, so *if* they have another story to tell I think it gets told.
I *want* more, but if Lynch and Mark don't have more stories in this world for us, I am okay with letting go. But I really hope they do have more stories. A fourth season of Twin Peaks would be a hell of a thing to look forwards to over these next three or so dark years, if you get me.
Edit: Oh, and a pointless correction. Looks like one episode from the last season of Hannibal got an Emmy nomination for special effects. Still horrendously shocking that they gave that show zero recognition.