I don't see eth hitting $0 anytime soon anyway with all the activity in development and enterprise's getting on board, it's sure to bounce back in the near future
Today, even if governments accept ETH as illegal, the price will not be 0. Billions of money should be withdrawn. Why would you believe someone who thinks the price will be 0 without giving any reason? His only concern is not about ETH, but about the whole crypto world.
This guy is non believers so it should not be credible for giving his opinion about this industry, we can't force him to think whatever he believes and what might satisfied him, the issue with ETH to turned to nothing will be far from reality not even that there's issues to this coin but with the numbers of people who are still in the project holding and supporting this project, there's nothing to be bothered it will survive.