When times are good, life is good for the shoe salesman. When times are bad, life is good for the shoe repairman. In the network-TV business, times are not so good. Its biggest hits are aging and atrophying, with no breakout smash among the fall's new shows. So the networks have hung on to several high-profile series, each with a potentially fatal flaw, to see if they can buff them up and get a few more seasons' use out of them.
Long-running series always evolve, of course: Law & Order may soon have gone through more generations of actors than...
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