[soonnow]

For the first point, I don't think it matters if the energy is green or not. It's still energy that is being wasted and could be used to in other ways. Just because the source is not directly burning coal, doesn't mean it doesn't have a net positive impact on emissions.

And for example Bitcoin can very much be squashed in my opinion. Enforce all transactions to be declared above a certain limit. Already the norm for banking that will likely become a necessity for cryptocurrency transfers. I just literally can see no way that this wouldn't happen. Exchanges will need to report it. I feel this would remove a lot of speculation from the market and illegal usage and leave the mature coins. Like some of those that you mentioned.

So when I was saying cryptocurrency I meant the large amount of unregulated coins, chief among them Bitcoin. I agree that there will be coins in the future especially government backed coins or coins that are linked to those coins. But I wouldn't expect Bitcoin to be relevant in a few years.