It is not free. Costs are incurred in the areas of R&D, maintenance, labour, etc. These are all costs that has to be offset by the producer and it should be more expensive than current methods. It's more of a cleaner energy than a free energy.
Proof of work will still function fine, you're possibly only (as stated probably not) reducing the costs from consuming the electricity. There are still scarce resources being consumed and incurred, production of ASICs, land, labour. It doesn't diminish any security of PoW based coins, perhaps slightly in the worst case.
State sponsored attacks, assuming 51% attacks has never been limited by the electrical costs or anything in that area. It is possible for countries to attack Bitcoin this way but it really doesn't make any sense right now and I don't expect countries to attempt it in the future either. ASICs required and the opportunity costs of having an attack is far greater than any benefits that they may have.
Indeed, that's why I said "almost free". And yeah, the acquisition of ASICs can be difficult too but not impossible for a government (they can reclaim whatever and even coordinate with other states).
But neverthless, the biggest obstacle to a successful long-lasting 51% attack is the energy consumption. And in a hypothetical future where nation-states has the monopoly of nuclear fusion energy production, they can use that advantage to do such attacks.
Nuclear power is not a trend for the future
-snip-
After the
Fukushima Daiichi disaster more than one decade ago, the world has been changing core approach to nuclear power.
Indeed, that accident accelerated the use of renewable energy as the future energy and some countries put plans to be almost 100% green in the future. New nuclear stations are planned to be build mostly in Middle East countries afaik while they should have hell of solar power!
Anyway, I don't expect anything to change in the next 20 years.
I think you both are referring to Fision... But I'm talking about
Nuclear Fusion, which is under heavy research since a lot of years and is much more clean and green than anything.
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