I don't want to overhype the ability to say this, but I would say that you have underestimated the pet proc heal that we already have. I've gotten a lot out of it, and it was definitely worthwhile. I've found the pet proc heal to help when heals are in short supply. It needs to be strong to matter if it's a pet proc heal for the group, but it can still matter if used appropriately. The idea of the pet taking say 50%'ish dmg for the group to get a 70k or so heal to me seems like it would be more accepted than a proc heal given the attitude presented, but whatever happens happens I guess.