And Stake is derived from Work. Some of you assume PoS exists within its own ecosystem. Even in PoW, the work is derived from previous works, ie, the work required to buy and build the hardware and pay for electricity, etc.
Yeah, now you are proposing a system that is going to be secured purely on that stake everyone acquired, THAT's the issue.
It doesn't exist within its own ecosystem, as I mentioned. Stake is derived from work and work itself is a security, ie, your work is secured by prior works. Everything that built it needed prior work and everything to secure it needs prior security, up the ladder you'd have yourself to secure and work for the currency, your community along with its own governance to state level and on and on up the ladder. PoW and PoS both exist within the same ecosystem.
Except, most people chose to move their stake from one system (USD) to another (ETH) and now, you are a powerful person in this new system. If you owned more stake in the Bitcoin network, you are still a user.