It's unlikely that they will be both made summonable because they likely take the same "character" slot on the server. To allow both requires that additional capacity that would otherwise make a summoner/scholar have a pet, chocobo and minion out.

A more likely thing would be to allow the minion inside the dungeon since they could take the character slot of the chocobo. Otherwise it's more likely that chocobo's could be made summonable in a solo 'undersized' party.