It's all so complicated.
They could deaden the ball more. This would in theory make pitching to contact more viable. However, fans like home runs! And overall offense is not at an extreme level or anything.
They could tweak roster/promotion rules so that teams have a harder time legally cycling through so many pitchers. In theory, this means more durable P need to be rostered. However, this would inherently put more strain on pitchers so if a team does NOT properly adjust the league has just legislated more injury risk!
They could incentivize keeping pitchers healthy with bonus picks, or taxes for offending teams, etc. Think, something like a comp round for teams that have the fewest pitcher injury days through their entire organization. Or taxes (money or picks) if you burn through too many pitchers. But again, s***** teams might abuse the system.
Wonder if there is a way to do it with the DH slot as a carrot/stick. Something like, if you pull your SP before 5 IP or 100 pitches and he is not legitimately hurt you lose the DH rest of the game.