I think it would be interesting if they took SMN in a similar direction of Ysayle. When we summon an egi we imbue ourselves with its power which gives us a number of oGCDs to use; each egi could have a different theme to its abilities (ie Ifrit drops a couple puddles of fire, Titan gives a few small defense debuffs, Garuda has some aoe blasts, etc.) Its not too dissimilar from what the old egis had with different skills, just more in depth and no separate pet for it. Ysayle showed us it can be done and now with the new tempering lore, we could theoretically do it safely.

It would also give much more room to expand the system instead of the ever longer rotation they're doing now. And if the egi skills don't share a recast timer it could open the potential for some very interesting rotations and weaving through different egis.