Two things - think it's really disingenuous and to bring into the argument incidents where tail-enders were hit in pre-helmet and pre-professional days. It's smacks of a emotionalism especially since I don't think they're analogous any more. Sure, with all the protection these days Alex Tudor got hit but that was Brett Lee who hit him - so fast, I doubt any batsman would have been able to avoid that bouncer (or with the addition of a lot of luck) plus Tudor could bat so he doesn't really count as a bunny who needs protection from rules or umpires, in my view. Was an isolated incident, not a sustained barrage of intimidatory bowling he should be saved from because he doesn't bat as well as others in his team.
Second, while we're on the topic of protecting bunnies (of which there are far fewer these days), with better bats, far (far) better protection, better coaching, greater professionalism in the game, etc. I would dispute that any batters need nor should be protected any more. If you can't handle it, find another job (which, sorry, it is). Or get better which is, as I said, what tail-enders have been doing for years now anyway. Tail-enders just aren't the same any more, most can bat and shouldn't be protected because they bat between 8-11 in the order.
Put it this way; with all the Tests tail-enders have scored runs in of late (check any recent scorecard), there's no way they should be protected. If the rule is to go, apply the concept of 'intimidatory bowling' equally to all batters or don't bother. It's a profession, FFS.