I was staying out of this thread but now that it has gotten back to be civil I'll add my 2 cents:
1. I think it's really, really important that cheap shots get taken out of the game. Things like what Quinton Dial did to Aaron Murray or when a WR just gets completely blown up... those are 100% avoidable plays and are also devastating hits. This is also a rampant issue in lacrosse and hockey, not just football. Lacrosse and hockey have really similar impact issues to football when it comes to cheap shots:
<object width="480" height="360"><param name="movie" value="http://www.youtube.com/v/x6r_VFAa5Nk?version=3&hl=en_US&rel=0"></param><param name="allowFullScreen" value="true"></param><param name="allowscriptaccess" value="always"></param><embed src="http://www.youtube.com/v/x6r_VFAa5Nk?version=3&hl=en_US&rel=0" type="application/x-shockwave-flash" width="480" height="360" allowscriptaccess="always" allowfullscreen="true"></embed></object>
<object width="640" height="360"><param name="movie" value="http://www.youtube.com/v/kium7tqJ71I?version=3&hl=en_US&rel=0"></param><param name="allowFullScreen" value="true"></param><param name="allowscriptaccess" value="always"></param><embed src="http://www.youtube.com/v/kium7tqJ71I?version=3&hl=en_US&rel=0" type="application/x-shockwave-flash" width="640" height="360" allowscriptaccess="always" allowfullscreen="true"></embed></object>
Last year against Duke we had two players late hit in the head (Nick Beattie, near season ending injury... Liam O'Connor, less serious)... and then against Virginia in the quarters there was similar dirty play and a very scary moment as shown above on one of those plays. I can't find a good link to a video replay showing the play in detail, but basically Ryan Foley shoots and scores and after the ball is already in the back of the net the Virginia defender comes up and launches a shoulder into the side of his head.
The key difference between hockey/lacrosse and football is that collisions are less frequent and players are less athletically freakish... but the helmet technology is also FAR worse and concussions are a really large issue. The only way you eliminate these plays is by HARSHLY penalizing players during games for cheap shots (IMO including immediate ejection for anything egregious) plus suspension of players for games afterwards. These steps need to be taken at every level... not just pros. Youth, high school, college. Kick kids out of games until they learn the lesson.
2. Then there are hits where it's a "bang bang" sort of play. I've never understood how to deal with this unless you want to teach people to dive at knees. Simply put, if a ball carrier or receiver "ducks" or lowers his shoulder... what are you supposed to do? There is almost no possible way to tackle them without head contact. What about if you try to wrap up and hit someone who is standing straight up (never happens, but is ideal) and lead with your shoulder? Ultimately, when you lead with your shoulder, you're head is also coming with it. So what if you're a 6'3" LB tackling a 5'10" RB? The crown of your helmet would hit them square in the chin/facemask area.
I guess my point is I don't understand how you legislate helmet-to-helmet contact out of the sport short of completely removing helmets... and then you would still have infrequent incidental contact, which would actually be MORE devastating when it does eventually happen. You can protect WRs, you can protect defenseless players, you can eliminate targeting and kill shots... and you can make the game safer.
But I think what the OP was getting at (correct me if I'm wrong) is that current initiatives which are more tailored to reducing the NFL's exposure than anything else are opening up a giant can of worms when it comes to irregular enforcement, gray areas, and an overall oblique message that leaves people scratching their heads and debating what is legal more than actually affecting positive change.
IMO, the NFL needs to focus on improving helmet technology and eliminating the big cheap shot... and stop screwing around with "minimizing kickoffs," QB-only protection rules with TONS of room for interpretation, etc.