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The test network (run bitcoin with the -testnet flag) is a different block chain, implemented so that the two chains never get confused. If anybody wants to start yet another block chain, it isn't technically hard, and won't cause any problems for "real bitcoin".
The hard part would be getting anybody to use your alternative; it would have to be better in some way other than just "I started the new chain, so I've got a lot of the easy-to-generate-at-the-beginning-coins."