Now we should in all honesty get additional summons as gems (or jewels) to be slotted in place of the ones we are currently using... for example, ramuh as a purple gem can be slotted to replace, say garuda... with his own abilities. Etc. Plenty of primals to choose from that have already been added to the game. So I can definitely see this as something that can be expanded upon. No need to increase or decrease the rotation either since the gems/jewels can be removed or adjusted depending on the summoner's playstyle.