I think everyone's situation is different....and can depend on a lot of things. A friends son is in his 4th year in the minors. He had struggled at the plate (and behind it, he's a catcher) the previous 3....and hadn't gotten above single A. Throw in the fact that his dad ( who was also his best friend/trainer/coach/etc) passed away in the fall of 2016 and it's been a real struggle for him. Nobody could blame him if this whole baseball thing doesn't work out.
He told people last fall that this year was going to be his last if things don't change. He was giving it one more season then if it didn't work, he was going back to his original plan of being pharmacist. Guess what...... he worked out last winter....more/harder than he ever had with the intention of making sure that if he was going to make this his last year he'd know that he'd given hit his absolute best shot.
As of today he's one of 2 catchers on a AAA roster and has spent some time with the big boys. Needless to say his thoughts on this "baseball thing" have changed a bit since last fall 