Obama briefly pitched the idea of this. A lot of people worried that the government providing services with the ability to verify identities would kill anomenlty online and it died.
For example, the IRS's free online filing thingy this year involves a third-party private company doing the ID checking and proprietary facial recognition database shit.
Hell, they didn't even white-label it behind a .gov domain and UI, which means they're training taxpayers to fall for phishing scams by disclosing their most sensitive data to any dang company with a spiffy web page and plausible-sounding domain name and a "Trusted By The IRS!" image sticker.