Probably acceptance. You can create that platform, but I wouldn't want to use it personally.

But I see room for that. I would prefer it for kids until they reach a certain age so they can decide themselves. Given, I would have a lot of requirements for the identity provider. This requires a lot of trust and I don't really see many on the horizon here.

But universally for the net it would be a huge setback. It would end up like TV and interactivity isn't the only reason it got less popular.