The devs push back against the idea of a GAAS because they want people to know it is a complete game out of the box with a story arc that you can finish. There is a rogue like challenge endgame to grind for those who want to. Hope they can appease both groups!
I have to imagine if the game is a success they'll start diving into the whole GAAS content delivery system and why not? Game seems ripe for expansion beyond what they've given. New Valorplates, new weapons, new areas with enemies and so on.