We have to carry so much crap in our wallets these days--various ID cards, driver's license, credit cards, health insurance cards, public transit cards, library, photocopier, frequent-flyer this and membership that, business cards, other people's business cards, cash heaven forbid, and the like. I can't imagine fitting any prints in there.
How low? Can the cell phone be that much worse than the disk camera?
The box Brownie with the meniscus lens was a pretty low standard in its day--not much different from an instamatic, but the film was a lot bigger.