This little interview snippet with Vince Russo comes from wrestleline.com and Wrestlemaniacs:

 

BEN: Do you think there's a point where, as the guy who writes the storylines, you should step into a guy who seems to show that the chairshots are affecting him, and say, "I'm sorry, but you just can't take any more chairshots."

RUSSO: You know what's so hard about that? This happens to us all the time. It just happened to us the last couple of weeks. Like the Undertaker has a really bad pulled groin, and it went up into his abdomen. So what happens with the guys is, we try to write the storyline around 'Taker not having to do anything physical. So that's why a lot of times Show is wrestling by himself.
But the problem is, if a guy is injured, or if a guy really shouldn't take a chair shot, once you put those guys out in front of the people, and they're in front of the people ... and they feel and they hear the people, they feed off of that. And once they're out there, whether they're hurt or whether maybe I shouldn't take this chairshot or not, being professionals, they want to give the people everything they can. And that's what happens.
We just wrote a storyline with 'Taker that we all together wrote him out of the storyline where we're not even going to see him, because if we had put him out there to cut a promo, he would have wound up doing something physical. Because like I said, once they're in front of the people, that's what they do.

 

This definitely is proof that wrestling gets "in the blood", so to speak. At least they wised up and essentially forced him to take time off. Of course, it shouldn't have gotten to this point, so he's at blame here. You wake up, you limp around, moving around is painful, you can't wrestle- hey, maybe you're hurt and should take some time off.