It's easy to predict things correctly when you control what your son will use, e.g., 'my son won't use a landline', well yes, you cancelled your home landline before your son was born. The original prediction was that most people and most businesses would stop using landlines but he concedes his son might still use a landline in an office some day and yet still considers the original prediction to be correct. The same is true for phone numbers, dedicated cameras, mechanical harddrives, arguably prime time tv but I can't really blame him here. Theatres are considered TBD but it took a pandemic that also shut near everything else down for much of the world, many businesses are in for a rough shake up.

The crazier predictions are ones that didn't come to fruition line no more floating window managers or mice and people no longer building desktop pcs, or ones the author still thinks are going to happen like no more wired internet connections.

Among the ones he claims as having come true, a couple of them didn't. Physical media like HDD has greater permanence than SSD, so it isn't going away yet. But his son also used it in gaming consoles, which (it may come as a surprise) are computers.

Also, you can't use whatsapp without a phone number. Several apps and services require a phone number for sign up or 2FA. So that one is bogus too.

Less than 50%. His predictions would have been more accurate if he had flipped a coin.