I had Morales in one of my main leagues.
But honestly I'd rather suffer losing a guy from an injury like this than to put up with under performing players. I'm not saying that you don't lose out from injuries like this (because Morales, Tulo, and Pedroia were all playing well) but at least an injury lets you know that you need to take action immediately. There's no middle ground. A guy gets hurt you replace him. End of story.
By contrast, take someone who's drastically under achieving (Lind, ARam, Berkman, Chipper, McClouth, etc). What the heck do you do with them? Do you ride it out? Do you make a move via a trade or add/drop? Stick them on on your bench if you have room and just eat the roster spot until they improve? Depends on the situation, but I think that poor handling of under performing players will drag you down as much, if not more, than suddenly losing a guy via injury.
"Don't take anything for granted, because tomorrow is not promised to any of us." ---Kirby Puckett