Tough to balance then if you can't change the Rampage to only target players and not pets.
Lately its a simple question of numbers. Most of us are now raiding with 2 or 3 people boxing anywhere from 3 to 6 characters. In the later tiers dedicating a healer to a pet is definitely not an option. We have our hands full keeping the Tank and the 3 Melee DPS alive.
All massively overhauling the pets themselves will do is make it easier on the newly 70s, it won't do anything to address the situation of pet classes on raid content. It might make the pet live an extra 5 or 7 seconds but really that's only like 3k damage.
Is there any way to separate rampage damage from regular? I know that the Tank never gets hit by Rampage, maybe you can throw that condition onto pets?
Or possibly increasing Pet's attack range to outside of Rampage radius?