I'd absolutely love an email 2.0 with E2E encryption, but I doubt the ability of the industry/community to create something like that anymore as much as it depresses me. That email is so standard and federated despite pressure to the contrary is something of an accident of history and the time it was developed. The trend now is the opposite. It would probably also require a foundation of secured DNS which could then act as a transparent root of trust, but that hasn't been doing well either. Even a lot of "security experts" insist on stupid shit like Signal or the like being a replacement. So we'll continue to use email for highly sensitive and secure material and it'll just continue to be a window for a lot of adversaries I guess :(. It's not hard to envision a system with a few simple upgrades to make it both vastly more secure and help deal with spam at a much more root level, the pieces exist at the technology level. Yet I doubt it'll get out together and adopted. Path dependency is hard.