And perhaps the horse will learn to sing.- The Mote in God's Eye
I dumped most of the cards out of my wallet a while ago by scanning them all (960x640 @ 290 dpi) and putting them into a photo album that syncs to my phone. I mostly haven't missed them, mostly. Sometimes doctor's offices get annoyed with making a photocopy of my insurance card off my phone (or I get annoyed with them taking my phone). Sometimes the barcode scanner has no problem reading off my phone and other times it works just fine. When it fails, people just need to type in the code. So that's basically worked.
I really wanted to carry my ATM card - I mean really, but Mrs.Chaos has currently talked me out of it. "What do you need your ATM card for?" "To get money from the bank." "No you don't. You just walk in with your photo ID and they give you money. Also, what do you need money for?" Fair enough for now. I really wish I had a bank that would let me deposit a check by snapping a photo of it. Not yet.
So I'm going to try an experiment where I just carry my phone, my ID and a credit card. No more. To inspire me I bought a new iPhone case that can only hold those items. We shall see how it goes.