I'd say I'm against the defensive sub rule, but I'm glad to see the revision to the targeting rule. I think another thing to keep in mind on that subject would be to consider the situations like the Notre Dame/Pitt incident where the ball carrier was equally at fault for the helmet-to-helmet contact, where the QB ducked his head forward in the direction of the ND player.
I'm still against the ejection, but at least this rule change fixes the major bug, where even in the case of the Navy/Middle Tennessee, where even though it was clearly a clean hit (Even though in that game it somehow wasn't overturned), at least the offensive team won't be getting a cheap 15 yards.