What new technology do you think won't make sense to you in 20 years?

Let's say there's a concrete divide between people that 'get' abstract thinking (through exposure and practice) and those who don't. Call it the difference between 'programmers' or 'engineers' and 'non-engineers'. I'm thinking of that nebulous thing that makes engineers different - systems thinking maybe? The thing that makes us inmates in the asylum, so to speak (referring to the book here) -- the thing people talk about when they say that programmers are bad at UI design.

Often as an engineer I catch myself thinking that given enough research, engineers can 'system-out' an understanding to almost anything. I expect to be doing that for the rest of my life; non-stop learning is part of the profession.

It does make me wonder (and this is the question I'm throwing out there) -- what do you all think the next divide is going to be? Do you think there's a technology you'll look at in 20 years time, with the same bewilderment that 'non-engineers' look at us with, while your kids who have grown up with it can't fathom why you can't understand it?

The closest I can think of for me is quantum computing; that seems different. I've read a fair bit about it and yet it still seems fundamentally alien to me. With regular programming, I can 'run the program in my head'. With quantum computing, I can't even seem to create a mental model of how it works or what you'd do with it.

So, what do you think the next fundamental shift in technology and thinking will be?