@rosborne979,
Any show, especially one in it's first three seasons, is trying to sell advertising to finance itself by getting sponsors. If the Nielsen ratings drop, they end up with charging less for a 30 sec. or more commercial, there's not enough money to continue with production. FOX makes so much on American Idol, their scripted shows are almost an afterthought.
I've now noticed that almost all the NBC scripted shows are current episode re-runs sold to USA and Universal, including, of course, their HD channels.
This economy is hard pressed to support expensive scripted shows which can't stay in the top twenty-five. So NBC was likely smart with their glamoured-up "1984" sci-fi show "Kings." Besides it gives "Deadwood's" Ian McShane another good excuse to chew up the scenery (which he does very well without hamming it up, I might add, even without the plethora of four letter epithets).
After everyone surmised it had run out of steam and killed of nearly all the original characters (except nobody believes Lex got blown up in that truck), "Smallville" is going into its ninth season, well, after Tom Welling has some liposuction (he can afford it after what they upped his contract for another season).
I think SSC painted themselves into a corner and couldn't wait out for the paint to dry.