We need cheaper ways of prototyping TV shows to see what will work. By the time you get a pilot episode up and running, you've already got sets, props, costumes, actors, scripts and everything else. Producing the second episode would cost you almost nothing, so the process is very loaded against new, innovative shows coming out (except for reality TV, which costs nothing but dignity). What if we produced 30-second ads for notional shows and released those online to see what buzz they created? You don't need a whole episode script and you can probably get away with a reused set and props, depending on what kind of show you have.
Mokalus of Borg
PS - Then again, you need each show to have a unique feel.
PPS - That might mean lots of CGI backdrops.