Yes to the first question. For the second, it would depend on easy/hard it is to mine to get to the point where you can replicate a snapshot, and how easy/hard

Yes to the first question. For the second, it would depend on easy/hard it is to mine to get to the point where you can replicate a snapshot, and how easy/hard it is to continue mining on from that point. It is very unlikely the new protocol will hold the same value as BTC would have had.