Not the benefit I'm talking about, I want market competition within each coin, not just from one coin to the next.  And it might not be useful to have multiple networks running and so people may just switch from one coin to the next, but introducing multiple networks can't hurt.  But a market will eventually use one good as money because money is defined as the universal medium of exchange.  So if Bitcoin becomes money, there may be other mediums of exchange, but it will have no competitors as money and then you can't switch to other coins.  The whole point of multiple networks running the same coin is to make that single coin more resilient, your option means that the original coin will fail, which is the problem I'm trying to avoid.