I'll note that while MLB adopted extensive new rules, the purpose of the new rules was to make the game play more like it did 40 years ago, when there were shorter pauses between pitches and nobody played the shift. The changes in the rules were accordingly fundamentally reactionary, made to undo innovations in how the game was played.
So, I suspect whether you want WotC to "learn a thing or two" from MLB depends on how much you want them to push players to play the game like it was played back in 1983.
