@CoffeeCantata
We've been going through a time like that over the last 20 years or so.
It's not just 20 years though. More like 40! Cash machines, credit and debit cards, first started becoming popular back in the 80s. Mobile phones and telephone banking in the 90s. There was a massive societal change in the 80s from people being paid in cash to being paid by BACS. "Home" computers first started appearing in 1980 (hence the ZX80!). Remote controlled TVs and videos and HiFis in the 80s too! The internet and websites started being rolled out in the late 90s.
Yes, it's awful when people are "left behind", but most older people who aren't IT literate today would have been young-middle aged back in the 80s, and most "could" have started using tech more whilst they had all their faculties, and keeping up with change as it happens is far easier than getting left behind and then having a mountain to climb.
Obviously, disabled people for whatever reason are different, but, to be honest, a lot of disabled people would have struggled in the old "paper based" World too. My MIL used to go to the bank every week, write cheques to pay bills, etc., but can't do any of that anymore, not because the bank isn't there, she's just lost the ability to do it due to dementia - last Christmas she tried to write cheques for family and the words and figures were all over the place! It matters not that we're in a computerised World, as she can't do "paper" anymore either, even though the facilities are still there. My point is that, yes, elderly people who previously used "tech" can find themselves unable to do it anymore when age and dementia (or other diseases) set in, but they'd probably not be able to do it the "old fashioned" way either, even when there are still bank branches and they still have a cheque book!
I honestly cringe when I see someone who could, but makes a big song and dance about not doing online banking, not doing online shopping, not using a smartphone, etc., as they're just going to really struggle as the years pass and they're left behind. People (those who are able) need to get on board and keep up with change. It's a one way direction of travel.