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Thinking short term
I can???t envision a scenario where we can routinely ???leave the wallet at home??? in the future."
You should have said "near future". Any science fiction fan can tell you: SF authors have been writing about wallet-less futures for at least the last 40 years. If you can't "envision" this possibility - can't see how it could happen - maybe you should be writing about other things.
As the technology advances, people and companies address all the shortcomings you mentioned. You don't think it is possible for your phone to be used as an identity "card"? Why not? All the same information stored on the magnetic strip of every card you have could just as easily be stored in the magnetic media inside your phone. Or it could be stored in the cloud and accessed by your phone. All that is missing is the "orders of magnitude" increase in security requirements to make it feasible. (Because "possible" is not always "feasible".)
All your arguments are feasibility based. As more people and business WANT to move the data out of their wallets, people and companies will invest time and money in making the electronic wallet future feasible as well as possible.