There is a lot of correct history, but the author opines conclusions that are debatable. Yes, passports are a way to control when comes in your country. Most countries, even the ones with liberal democracies, insist on controlling their borders. I may be wrong, but I know of no US law that requires people that leave the country to have a passport. Yes, they would likely have a problem reentering with one, although, it once was easy to visit Mexico and Canada without a Passport. I personally did so several times some decades ago.
Passports will still be around for decades. Most people in the USA don't have passports, since you only need them to travel outside your country.
Passports would likely be replaced by a scanable card rather than a chip injected into the body. Americans would not go for the latter option. We have been on about 20 cruises and the cruise lines give you a key card that will open your cabin as well as include information on what promos you are entitled to and your loyalty status. Also, it includes a photo. Before you enter or leave the ship, you much have you card scanned.
Sweden and Norway plan to do away with cash and everyone would rely on credit, debit or other cards with the monetary equivalent.
The USA considered doing away with the penny, which is almost worthless, but many social warriors claimed that move would harm poor people. I served with the Army in Europe and at the penny wasn't used. When you used the commissary or PX, every clerk rounded up or down.
I suspect that criminal elements would oppose doing away with cash. That move in most countries is still decades away. I read a few years ago that 2/3 of the US dollars in currency are outside the USA.