RA has provided great value over his contract. He has been around a 2 WAR pitcher, can eat up 200IP and has some added benefits like his defense on the mound and "Dickey effect". He wasn't and never will be worth what was given up for him however that is on AA, not Dickey.
With all that being said, I doubt he comes back next year. 40+ year old knuckleballer whom already has worrisome stats this year (no strikeouts in 3 games, higher walks, etc) and while it may normalize over the season its not really encouraging heading into the future. Plus I want to be over and done with on the catching situation. I want there to be no excuses on why Martin can't "catch" a certain pitcher. Thole has cause issues with roster management in building a good bench and is not a MLB player.
The $14M + w/e given to Thole can be reinvested better.