Really a little chance that Ethereum will possibly to be zero value. A lot of factor like what who above me mention and community wouldn't really easy to left a project until zero value if it is not scam and be dead project.
with the development so far and this big who thinks ethereum can be 0? ethereum really has become a big crypto, with a large market and community, it won't be possible. many people have it, to scam is definitely not possible.