The things mentioned in the first post can not happen if BTC continues to be implemented and accepted by different segments of the market. If BTC gets globally accepted as a payment method, it is hardly unlikely that anything will replace it in a couple of decades time period. Think about it. No matter what revolutionary, new technology they invent, it will again have to go through everything that BTC's been through. So, no matter what happens, it will be a far in the future and who knows if any of us will live to see it. I am more eager in seeing BTC's new possibilities and ways of using it.