Personally, I think it's a good thing. Those warnings are already so nearly ubiquitous that most of us have stopped paying attention to them.
Does anyone seriously think that parents are going to stop their kids watching Sesame Street because it comes with a "parental advisory"? If so, they're dreaming in technicolor.
The reason I think it's a good thing is because it may drive the final nail in the coffin of believing that paying attention to parental advisories is better than actually taking the time to find out what your kids are watching.
It's the old story - "If everything is top priority, then nothing is a priority." The people who did this are, essentially, oblivious to the obvious (to the rest of us) fact that by doing so, they have admitted that the whole "parental advisory" thing is a useless exercise that nobody pays attention to.
And nobody is going to be affected by this in any way, shape or form, as far as I can see.
_________________________
"The mind is not a vessel to be filled but a fire to be kindled."
-Plutarch