Indeed, UBI seems to be the forgone conclusion to this path we are being driven down. In fact I'd say that manual labour is one of the main things to be replaced and then all that is needed is the engineers to fix and program the machines. Then with this drive towards AI, perhaps even they will be replaced.
I've never thought of it that way with regards younger people. Guess it would depend on the examples they have around them. Some might be happy subsisting on the basics, but would a desire to have more, when they see others working for more, drive them to learn and contribute. I know that would drive my eldest, assuming she couldn't weedle things out of others instead.