Will the progressive movement eventually implode and 'eat their young'?

In my interview with San Francisco Mayor Gavin Newsom, he calls for inclusivity and warns against the progressive movement 'eating it's young'.  He says progressives should learn lessons from the failed conservative values.

See the  interview here
Progressive Values Stories: Gavin Newsom on Inclusivity and Noah's Ark
http://www.opednews.com/articles/Progressive-Values-Stories-by-Edwin-Rutsch-080816-767.html

and

Failed Conservative Values: Gavin Newsom on Division & Schizophrenic Tasmanian Devils 
http://www.opednews.com/articles/Failed-Conservative-Values-by-Edwin-Rutsch-080808-690.html

What do you think, will the progressive movement eventually implode and 'eat its young'?

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