Proof-of-Work update is not a threat to miners, it is a necessity for users
Luke-Jr pointed out that there is a soft forkable way of giving a way to the user to opt-out. I need more time to digest that, as I am unfamiliar with the idea, but it would indeed change the “Safe Hard Fork” part of this article, as miners would not have to mine empty blocks on the original chain. The existence of such alternative would make mining empty block on old chain clearly hostile.
https://medium.com/@nicolasdorier/proof ... .gsts9tcwz