Partially true because charmed pets wouldn't die as often, but remember using a cure on your pet means you are drawing extra hate. This would mean BST wouldn't cure pets during fights very often, as they work very hard to balance hate. They would cure after fights, but I don't see that as posing a balance problem. Also, there are plenty of areas, most high level areas in fact, that you either can't charm any of the enemies around or none of the ones you can charm are worth it.That would severly reduce the demand for Jugs
I also don't see the demand for biscuits being hurt too severely by it because you generate a great deal less hate using those than you would casting cure3 or the ever popular hate monstrosity, cure4.
I do agree though that for most pet jobs it can be handled without allowing cure spells.
BST - As posted above, increase the efficiency of biscuits, and maybe lower the recast timer.
PUP - Increase the potency of oils, and again maybe lower the recast timer.
DRG - Whadda ya think I'm gonna say? You guessed it so I'll just be generic... improve Spirit Link.
SMN - Lower BP timers on Ward abilities only, to preserve the balance of damage output, and increase the potency of the Ward healing abilities because they basically suck at high levels.