I think the structural (networks screw things up) and statistical (less SF made, fewer good shows) arguments are true. However, I suspect there's also a sort of ignorance-driven cargo cult mentality amongst those creating the shows (http://zornhau.livejournal.com/tag/genre%20tv%20fail)
TV SF
Date: 2010-03-31 12:35 pm (UTC)no subject
Date: 2010-03-31 01:10 pm (UTC)It's an interesting one all right.
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Date: 2010-03-31 02:18 pm (UTC)no subject
Date: 2010-03-31 03:02 pm (UTC)no subject
Date: 2010-03-31 04:12 pm (UTC)no subject
Date: 2010-03-31 04:18 pm (UTC)no subject
Date: 2010-03-31 06:59 pm (UTC)