[dzhiurgis]

Assuming 13% of adults in US don't have a drivers license that leaves with 33m people without driving license.

100m / 33m = $3 per person to issue a valid ID. Dunno how much an ID costs in USA, but over 10 years it would pay itself...

In reality the amount of people without some form of Id AND on benefit is at least an order of magnitude less.

[Volundr]

Here in Idaho it's a minimum of $35 dollars for a 4-year (the shortest you can get). The cost may be higher or lower elsewhere. Now work out all the other costs of this effort (validating this stuff isn't free, getting caretakers to drive one to an office, damage done to people who don't get the memo or are unable to comply, etc) and you might be ready to work out if this particular plan is worth it.