I agree it’s a high quality show. But it’s a mini-series and will be gone soon.
I don’t think these two actors will continue on in a return engagement. Too many movies available to them. Also, Cohle doesn’t seem to be available for further police work, although writers can be creative.
Each season is going to feature two different A-list actors and a completely new storyline. I like this concept, as it ensures the show won’t get stale after so many seasons of the same faces. Tell a story, be done with it, move on to the next one.