Umm... I think you might not have read the stretch goals right. Now it's a 12K, we're getting ways for monsters to use SoM, but we still have two more stretch goals: at 15K, we get "even more archetypes", implied to also include archetypes for Paizo martials and (maybe) some SoP classes, and at 20K it's "expanded GM support" by including a mini bestiary of martial monsters of all CRs. If and when we top 20K, then we'll worry about more stretch goals.