Is the ballpark at fault? Should they have known about the danger? Of course.
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But....is he also at fault? Should he have not been aware of the danger he was putting himself in? Of course. Is it not "reasonable" to expect that a hard fast line drive might be hit directly at "somebody" and that "somebody" might be him? Yes.
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Some people thrive on getting "close to the action." Well, he got "close to the action" when the "action" smashed into his face at 100 mph.
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More netting will go up.....not just to protect the fans from hard fast line drives.....not just to protect themselves from possible liability....but to protect fans from themselves.....and the choice they made to buy tickets in those seats. 
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Hope they like the "new view" through the netting. Maybe they'll put up Plexiglas like they do for hockey?