cash is not going to die, at least not in our lifetime but what does that have anything to do with bitcoin? bitcoin was not created to kill anything! besides who cares what the "bankers" think about bitcoin, it was not created for them to use. it was created so that people don't need them if they chose to spend their money. so that they have an alternative method that doesn't require these third party parasites that can only live because people need them.
theyre too busy to learn it
don't worry in a couple of years they will have enough time to beg others to teach them how bitcoin works and beg people to come back as their business starts to fail and they start needing another bailout.
If they want to learn how Bitcoin works in the next few years, I think it's too late, because in the next few years the price of Bitcoin will grow and grow countless and I'm sure everyone will certainly ignore it to teach them how Bitcoin works.