I've done some thinking about this, and a possible solution is a bunch of cross signed CA's like the Federal common policy / FPKI for cross trust amongst federal agencies, but done at a state DMV / DPS level. Driver's licenses / state IDs could have certs embedded into the cards and then be used for things like accessing government websites, banks, etc. Yes there are some access concerns, and some privacy concerns that this is in essence a national ID, but what we have now is horribly broken, and we're already being tracked. We get all the downside of pervasive tracking, but none of the upside.