IMHO it’s unrealistic, because people hate taking responsibility. Look how long password managers have been around - they’re a fantastic and useful technology. Does everyone use them? No, because people still use their birthday or their cat’s name as a password and think that’s fine… How many people use 2FA? Even fewer, and it’s not that hard either. If people don’t use these, how can we expect them to use self-custody to actually own their bitcoin?