What was the point of bringing Felix Blake back in AoS Season Three if he was never going to appear again and just be replaced the following season with some random Russian guy as the leader of the Watchdogs?
To this day we still have no idea what he or the Watchdogs are doing or if they're even still active.
I'd like to believe that they might be brought back through Disney+ or future movies, but I don't see that likely happening.