Increasing the number of Pets won't add anything it'll be effectively giving us new glamours as job abilities which is a waste. I'd say it's much more effective to add abilities to the Summoner and the Pet. If SE made an actual Pet Focused job it'll be Beastmaster since their monsters are permanent and do a majority of the damage. The Summoner generally calls a summon monster which deals heavy damage for 20s does its big signature attack then leaves. The summons themselves were just flashy spell animations.