So far, both series have done a decent job on their own so all CBS would really need to do is just provide finances and oversight and guidance
Hollywood execs - and actors', extras' and directors' unions - don't work that way.
Throwing money at amateurs doesn't necessarily produce a higher quality product, nor guarantee a larger audience. And would fans who love making a show for fun, and no profit, really want to toss in their day jobs in hope that things would be... better? More authentic? Better accepted?
Have you seen many professional publishers buying up fanzines or sponsoring the amateur editors to print more? Have you seen many amateur home chefs get pursued by gourmet restaurants?
I suspect Phase II has a larger fanbase than you think