Maybe it isn't the brightest thing to take your lead in grammar from baseball. It has long been acknowledged that baseball players are among the poorest educated among the players of any major sport. So many are drafted right out of high school and receive their "higher" education in the minors, with little or no college. Despite the relatively low state of our educational system, there still has to be some advantage to having a college degree.
It's that "Who cares?" attitude which is part of the problem. Who cares that kids are no longer receiving much in the way of a basic education? They don't need to actually know anything since they can depend on calculators and computers and spellcheckers to cover their shortcomings, right? While these are all wonderful tools, which I use regularly, what do these people do when put in a situation where such tools aren't available? Mostly they fail. Taking our lead for the future of our language from such people is a poorly founded road. It's a lot like learning the Rules of Golf from someone who has never actually seen the rule book.
Don't forget that ...
A) I wasn't justifying it as a scholarly word by claiming it came from baseball; I was simply pointing out that I think the word was older than suggested. I was just doing a little bit of "etymologizing." ;)
B) We're talking about one silly slang word here ... not the downfall of the American Education system. That's why "who cares" applies.