There's an important point here which I have made which I'm not sure you have understood: The details, at this point, are irrelevant. Bitcoin is the first currency to solve the problem it solves. No other currencies of that nature can possibly beat the enormous momentum that bitcoin has. No bitcoin alternatives will survive for the same reason no alternative WWW protocols will survive, or no alternative internet protocols will survive, or no alternative set of microprocessor instructions will survive, etc., UNLESS they solve a different problem than the problem solved by bitcoin.
i was not responding to that generalised speculation. i was responding to the particular defence you offered of it in your paper, which, as i have said, is not correct as a logical matter.