Holding a private key in a way that is both usable and secure is not easy, for fundamental reasons. As such, it is impossible for this to catch on with the general public, ever.
A far mor likely outcome is for government-managed identities to become the only way to access certain kinds of services, for better and for worse. Governments already have the identity management part handled, with the legal system acting as the ultimate fall-back for any corner case. The integration is already widely used for certain services (the entire financial system relies on government-managed identities already, all around the world), so it's just a matter of extending this. It also helps solve certain less talked about problems of identity systems, such as preventing children from accessing certain kinds of content.
Ideally, instead of the current solution of every institution having access to all of your personal details so they can check your identity with the government, governments could start working for the opposite model - a government-issued and managed IdP, where only the government knows your personal details, and where enterprises get an opaque token they can use to ask the government about a set of details they need to operate their business.
A far mor likely outcome is for government-managed identities to become the only way to access certain kinds of services, for better and for worse. Governments already have the identity management part handled, with the legal system acting as the ultimate fall-back for any corner case. The integration is already widely used for certain services (the entire financial system relies on government-managed identities already, all around the world), so it's just a matter of extending this. It also helps solve certain less talked about problems of identity systems, such as preventing children from accessing certain kinds of content.
Ideally, instead of the current solution of every institution having access to all of your personal details so they can check your identity with the government, governments could start working for the opposite model - a government-issued and managed IdP, where only the government knows your personal details, and where enterprises get an opaque token they can use to ask the government about a set of details they need to operate their business.