That would probably require an entirely new version of the game. Right now, Prismatic co-exists with the regular Subclasses, and it is clear they structured Prismatic in a way that, while it is potent, it doesn't make the other Subclasses irrelevant. I imagine they'll keep maintaining that balance in the future because, otherwise, there'd be no reason to play builds from the other five Subclasses if you can just build them within Prismatic and get the Prismatic and Transcendence abilities on top of that.