Roger talks about the change over from UPN to The CW in Season 4 and how it affected the show, wasn't Enterprise on UPN right up till the end, with The CW starting the year after it was cancelled?
It was. UPN lasted until 2006, I think. Probably a transition period, where UPN management were replaced by key players looking to be the new broom, determining what gets to stick around and be carried by the CW. For Enterprise to have run a full 7 seasons, it would have been picked up by them.
I wonder if they'll be able to interview CBS CEO Leslie Moonves (then instrumental in merging UPN with the WB), by the time they reach a Season 4 documentary? He was so upbeat about the ratings in Titan's Star Trek Magazine, immediately before the cancellation announcement on February 2, 2005.
When did the cast know for sure they wouldn't be continuing onto a Fifth Season? During the filming of "In a Mirror, Darkly"? Probably not the case, but it has a certain awful irony being on TOS sets...