Therin of Andor;8340583
In reflection, I fear it may not have gotten past the 13 episodes. The cast, as described in the "Phase II" Writers' Bible, seemed way overextended for a 70s show. Especially after the original series essentially concentrated only on three cast members. "Phase II" was to have "the big eight" (ie, including Chapel, but with Xon standing in for Spock), [I wrote:
plus[/I] Rand. And Decker and Ilia. Although Xon was a whole new, quite different Vulcan, I'm sure fan outrage about "Where's Spock?" would have been strong.
I think you're right, if they'd tried to feature everyone every week. It might have worked if they'd gone for more of an ensemble approach, like you see in Deep Space nine, for example. In DS9 they had a large number of regulars, plus a pretty big list of recurring characters. But you didn't see everyone all the time, just whoever was needed for a particular story.
Phase II might have worked with this. You don't need Chapel every week. Heck, you could have gone a week without Decker or Xon with the right story. That would have saved some money, and maybe given the writers a chance to explore some characters they might not have otherwise.