Looking at the way the showrunners talk about the project though – especially in interviews – it’s clear that they have some long-term vision for this show and it’s not being run on a season-by-season basis. It might not seem like it when watching the episodes themselves, but the producers’ attitude makes it clear that they are always evaluating different options for the future.
Because of this, it wouldn’t be surprising if it turned out that the Red story is leading up to something even more major that will be revealed towards the end of the season.
Red could even set up a cliffhanger for season 5, but of course that theory is taking things a bit too far. Still, we wouldn’t put it past the producers of this show to use his character in such a way.
One more detail from those interviews is great reassurance to fans. It’s obvious that the people running this show are having a lot of fun with it, and they treat it as a special project as much as their fans do, if not more. They aren’t running it as just another show, which makes it very likely that they are preparing something special as a treat for their fans. It might not arrive in season 4, but if the show keeps enjoying its strong reception, the producers are guaranteed to get braver in their experiments in the future.