If we can let go aged doctors coming back for cameos i'm sure a quick, no to be continued crap, film could give us a happy ending.
I agree it's too late to do anything else... a mark 2 would just annoy.
I've always been a little upset they never went back and brought closure to everything that was meant to happen as suggested by 'stasis leak' even though that conflicted with some of the suggestions made by 'future echoes'.
..oh god... I've become a nerd.
Anyway, I think they got a little greedy during season 8 and tried to set themselves up for more. 8 in my opinions, was a bit of a return to form from season 7 but not completely. resurecting the crew was a fun idea, but if they couldn't get Peterson and Hunter it was a bit stretchy to go down that path. In fact, after the huge break from series 6 and missing half the writing duo, they'd have taken the safe bet and plotted and nice wrap up for the series in general...
But that's television for you...
We don't all have rich fairy god fathers (like Gilligan's Island did) who say "what a shame those people never made it home, infact, wait here's some money, go bring 'em back and end this thing properly."