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I agree that those other coins seem like better use for payments today. But are you making the argument that they are the better payment mechanism of the long term? Each of these altcoins has their own drawbacks.

BTC cash, for example, reduces transaction time by increasing block size so more tx can be added into each block. However, by increasing block size you also increase technical requirements for each individual node and eliminate much of the decentralization that Bitcoin enjoys, concentrating the power in the hands of those with powerful enough systems. This exposes Cash to market manipulation and, again, it hasn't been battle tested like Bitcoin has.

That's true I agree.
I can't tell you witch one will make the race.
May a new coin comes arround and will be the paymentcoin.

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