Would you buy a player companion that is focused on 1-4 classes? If so what would you want?
I would buy..
One that is focused on Kineticist.
One focused on the Shifter.
One that is for Bloodragers and Sorcerers.
Have you heard of Legendary Games? They've done this. And Paizo won't be doing so.
It's a what if question, I am not expecting Paizo to have done or will ever do anything like this.