I can kind of agree with the OP although I think the 'sci fi' definition used was probably not the best. 'There isn't any decent space based sci fi series anymore' would probably have been more accurate.
Things like babylon 5 crusade (a follow on to b5) got canned due to low ratings, the lost tales was stopped due to budget constraints (warner brothers wouldn't pay out enough for it to be decent) and there hasn't been a star trek series for ages. Farscape was lucky to get finished off with the peacekeeper wars, andromeda went rubbish after season 3 and LEXX is unlikely to be continued anytime soon as it was never really mainstream enough to start with (I enjoyed it though) and serenity was canned due to the usual lack of numbers - maybe theres a reason for this (timeslots anyone).
BSG has run its course and stargate is basically dead in the water as I doubt universe will last long but I hope to be proven wrong.
The current trend for sci fi based on super powers ala heroes, mutant x, sarah connor chronicles all seem to get a bit dull after the first series. I enjoy watching summer glau but even she can't keep me entertained (well she could but she's not with me when its showing

) if the story is dead boring.
Theres been other things like the new knight rider (I actually enjoyed it strangely) or sanctury (which was ok until sg1's Samantha Carter spoke english badly) and of course theres the 'sci fi' on terrestrial channels - primeval (only good for hannah spearitt), doctor who (getting bored now) and the soon released triffids.
Part of the problem is TV stations are only after the quick buck now adays instead of looking at the big picture, the likes of Star Trek, Babylon 5 and BSG have brought in a large chunk of their profits from dvd sales but unfortunately the current batch of TV execs are a bit dumb and can't see the bigger picture sadly.
And it would be nice for a space based sci fi show to replace some of these rubbish shows (dancing on ice while singing karaoke etc) which seem all the rage now due to their 'high ratings' (maybe its cos nothing else is on!).
Star Wreck in the Pirkinning - hell thats better than some of the drivel we get on the bbc

although I do prefer the ships when they're more based on the original series rather than the remade models.