If and when this gets to MLB, there will be even worse cries than there is by some about the "sissifying" of the NFL. I think of it a lot like smoking though ... back many years ago, people didn't know how dangerous it was to their health ... and of course, there were always stories of so and so who smoked 3 packs a day and lived to 100. But I think most people today realize that the odds of getting lung cancer, etc. are greatly increased and many of us have relatives (my dad for example at the age of 59) who died from it.
As few as 15 years ago or so, I don't think most people thought much about concussions ... I remember people laughing when someone's "bell got rung". But now it's being proven that repeated concussions greatly increase the odds of permanent damage. While most baseball/softball players shouldn't have repeated head injuries, it certainly is more possible for catchers and the collisions at the plate, and it's just why take the chance ... cause some think it's sissifying the game ... sorry, but in my mind, it's not affecting the quality of the game much if at all ... it's just smart.