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The Paper Passport Is Dying
(www.wired.com)
This is a most excellent place for technology news and articles.
I have 3 passports, how does it know which one I want to use?
The "solution" to this will be that you'll only be allowed to have one at a time. Choose and choose wisely. Changing will mean a huge amount of paperwork each and every time.
Inconvenient? Tough. Unless you're rich.
There'll be a tier of "known persons" who will be allowed travel without needing a passport, a bit like how it already works for the British monarch (and probably others I don't know for sure about).