I'm of the opinion baseball is just about perfectly designed at it's core...90 ft from home to first was perfect 100 years ago, it's still perfect now. I'd rather not mess with that too much. And as noted in the post you quoted...baseball has positioning rules...defenders (except the C) have to be stationed in fair territory (rule 5.02) (and I forgot earlier) that the pitcher has to assume a legal pitching position. Other than that, "Except the pitcher and the catcher, any fielder may station himself anywhere in fair territory. " In your hypothetical, I'd imagine hitters would soon learn to pick up the ball anyway, and the hole in the defense would ultimately prove more damaging than any possible benefit. Baseball's defensive positioning has evolved over time, I imagine it always will, and if standing between the pitcher and the hitter proves workable, let it go, at least until it results in drastically fewer balls in play, at which time, OK, take a look at it. If we're going to help offense, I'd rather they find a way to reduce K's and put more balls in play. And I'm also of the opinion that baseball should specifically stay away from trying to emulate other sports (at least too much), because one of the things I like about baseball is, it isn't football.