2. Regulate only 1 Asic per house hold.
They can certainly try.
But to be honest , I am totally over the PoW verses PoS debates,
It does not look like it.
Hey, you can always make a fork of bitcoin and have it run on PoS, then feel free to use that, and there are indeed several coins that run on PoS.
A double spend has never happened because it is simply not possible. Only one transaction or block made it through, there was a reorg, or something, but it was not spent twice.