What do you make of this?
Some more Qs:
1. Is it possible to move any of our coins held in SegWit addresses to legacy addresses (so that they would belong to the legacy chain if the above attack does happen)? Does the fact that, at some point in their history, those coins were held in SegWit addresses, taint them in any way? Would they still be considered as fully belonging to the legacy chain once moved to legacy addresses?
2. Would you do it? Do you think it's worth it?
3. Do these questions even make any sense?
4. Am I wasting my time with all this?
Thanks for any insights.
Many thanks to everyone who replied to my above post. I also don't believe such an attack will happen, and if it does, it will fail miserably, just like all the others before it. Bitcoin is growing fast and getting bigger and stronger day by day, and FUD is expected to intensify, especially around the time before/after the 2020 Halving. Business as usual.
@nutildah: I know there's currently one chain, but during the attack there will be a fork and two chains will exist at that time, the SegWit one (current) and the Legacy one. Those who keep their coins in Legacy addresses will end up with the same coins in the Legacy chain, plus the same amount of coins in the SegWit chain (like the BCH airdrop). Those who keep their coins in SegWit addresses will end up with the same coins in the SegWit chain, plus the same amount of coins in the Legacy chain, but those coins (in the Legacy chain) will be "free-to-spend" and will be taken from us and given as a reward to the mines for switching their mining operations over to the Legacy chain. So, those with coins in SegWit addresses will eventually end up with only those SegWit coins (in the SegWit chain), whose value will drop to near-zero due to the majority of the miners mining for the Legacy chain and enjoying the riches of their rewards.
Sorry for the spaghetti paragraph above, but that's how I understand it. It looks like total FUD to me, and it's not at all my intention to spread it, but I think it's worth discussing the different possibilities and the plausibility of different scenarios. More info = more security. Better safe than sorry.