It's absolutely abhorrent that you would begin to think this. There are plenty of disabilities that don't allow people to use technology. Not to mention, there are plenty of people who are religiously or ideologically against new technology. Making it a REQUIREMENT to do anything is absolutely not something we should be promoting. To add on to this, in both of your examples, none of those two things were required. You could get a friend to call with you, or go to the place to set up an appointment. Literacy is something we already recognize as extremely important and we absolutely do have accomodations provided for people who are illiterate.
Asking people to "be responsible for their actions or lack of them" when you talk about disability is just blatantly incorrect. Remember, we're all just temporarily abled. Some day you will grow old and have the inability to interact with modern technology. I bet then you will be very upset if everything started requiring it.