A thought on the Kos crowd

What would happen if the Democrats acquiesced to the wishes of the Kos crowd and made them the mainstream of the party? My sense of the "net roots" is that they get all of their energy, anger, and motivation from fighting the fights they can't win. When they fail, they are reinvigorated. What would happen if the Democrats actually gave into them? I think all the wind would be taken out of their sails and they'd start fighting with each other, just to have someone to fight with.