I work at an property and casualty insurance company out on a rock. Our president has lunches once a month and all the employees rotate through, he answers questions, people mingle, etc.
I went as a fill in this month and one of the questions is whether our firm would issue digital ID cards on smartphones, and he said we were looking into it...
I was shaking my head slightly and he looked at me and asked with a smile, "So what is the IT guy's opinion?"
I smiled and replied, "Cool tech, but personally, I would never hand my phone to a member of law enforcement without a warrant."
He replied, "I can see your point."
So sure, while I can agree that having some sort of digital something that keeps secure digital records that are public record anyway to provide to law enforcement upon request, AND a smartphone, is certainly better than a wallet full of paper and plastic cards AND a smartphone.
But ONLY a smartphone, or any single device, with my personal and what likes to be considered private data as well, I don't think so....