The programmers are probably all working on Imperator.
Still, I would rather have less DLC with more content and reworks of the many problematic systems (Holy Fury approach) than a constant stream of nonsense DLC which add nothing of value like now.
But that would make PDX less $ so I doubt that will happen. Certainly not after the EU4 team set up the money printer (Mission Trees, Estates, etc. Things that can be made with very low effort and sold as DLC feature)
Thats the holy grail of gaming companies: to turn their franchise into a Esports model Kinda like how Fifa sells the same game every time but with updated names of players. Why not sell a DLC with just updated missions, national ideas, events, provinces and and estates for every region of the world