It's pretty simple. Just make them unkillable and make it to where they aren't even targetable. The reason I say this is because it is ridiculous fighting these pet builds when you can just kite around all of them. If you've fought a good pet sorc you know what I mean. Sure this a nerf but now your pets would be unkillable.
And then from another point of view this change would also put pets over the top as they would have no counterplay since you won't be able to kill them. My idea to give them counterplay would be to change pets from a toggle to a real live buff. This would make it to where you have to reapply them every so often and it give you a chance to bash your opponent.
Changing pets from toggle abilities to actual buffs would put their usefulness on another level as well and would encourage more players to run them. Just some ideas I came up with.