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The Paper Passport Is Dying
(www.wired.com)
This is a most excellent place for technology news and articles.
More and more not complying with digitalization will get you into trouble. I don't think it will be mandatory but expect to run into delays, similar to how you technically have the right to refuse the x-ray-like machine at airport security, but doing so is time consuming, everyone will hate you for it, and cause you significant delays, on top of making you look suspicious.
And it sucks.