For the loud and ever-present "just hit the ball the other way" crowd, I'm reminded of the famous quote:
In theory, theory and practice are the same. In practice, they are not.
We have seen the shift, in practice, for years. And we now know, in practice, how everyone in baseball - front offices, analytics experts, players, managers - have all determined the best way to attack the shift: keep pulling the ball and swinging for the fences. Bemoan it all you want, but they have done the math - based not only on theory but also years of real life data on the field - and determined that pulling the ball remains the optimal strategy to score runs, and therefore to win baseball games. And until that math changes, no one is going to just hit the ball the other way on a regular basis.
That's why baseball had to do something. I'm glad that they have...in theory. We'll see how it actually plays out in practice.