The complexity of the software that manages the N versions seems terrifying, and decision-by-committee in the implementation seems problematic. 3 implementations could select different sequences of responses to a situation, each of which individually is correct, but which are disastrous when combined by vote. E.g. say they're voting on 3 different numbers that have to add to 1; proposals are (1 0 0) (0 1 0) (0 0 1). Consensus is (0 0 0), oops there goes a billion kilowatt dam.
