Good points, Christopher. Indeed, in a universe in which big network shows are routinely canceled midway through their first seasons (sometimes after only one or two eps!), I've never quite understood the "Syfy cancels everything good!" refrain that tends to pop whenever a fan-favorite genre show gets axed--often after three or four or even five seasons!
Most freshman shows get cancelled. Genre shows on cable actually tend to have better chances of survival than most.
It's almost as though we've convinced ourselves that every genre show is entitled to at least seven seasons--and that anything less is an outrage.