Good series rarely face a good ending.
I've been a Farscape fan after seeing 'Eat Me'. It was so shocking good (YMMV) that I had no choice but to watch all episodes. It was a shame season 5 never showed up, sigh. The miniseries was okay, but they tried to put too much in it, I suspect they had much more planned.
There's an interesting aspect of Sanctuary... if concepts like this are viable (if not commercially then at least technically) then smaller and / or less commercially interesting shows may show up now and again, and old (canceled) shows might see a revival.
If production costs vs. viewer ratings are important, then with lower production costs lower viewer ratings may become acceptable.
Oh, and this may spark some controversy

but I didn't like 'blonde Sam' whilst 'raven Sam' is a far more interesting character, with that knowing, somewhat annoying smile. This suits her much better. (Never been a Stargate fan, untill Ben Browder and Claudia Black showed up... shades of 'Scape indeed.)