Two QBs have broken ribs because the didn't do the "QB slide" in an attempt to get a TD. The hits were legal hits and in Hasselback's case, prevented a TD by him.
I expect that you will have to basically let the QB slide in the endzone next year or face a penalty or a fine.
I agree with you for the most part, but I'd be for a rule that treats the endzone like the sideline for running plays. It's kind of poor sportsmanship to see defenders making big hits on players after the ball is clearly possessed in the endzone. I think the play where McNabb was injured was completely unnecessary since the play was over once McNabb crossed the goalline with possession. If he'd have been hit like that after going out of bounds, there would have been a major penalty if he wasn't ejected.
I have no problem with contesting a passing play as the player has to keep possession through to the ground, but if he's made the catch and has both feet down with possession and makes a football move that would make him losing the ball a fumble anywhere else, then you shouldn't be able to hit.
Bottom line is that when a player is on the ground all that is necessary is to touch them. Flying in and ramming them in the back is excessive and poor sportsmanship.