Re: fast forward.
But consider 100 years in the future. Where will the UBI come from then? What will the citizens of 2117 be getting. And more importantly, what about the families that have known nothing except getting all their money from the state for as long as any of them can remember - what will they be like?
You're not thinking this through logically in my opinion.
As we move to an ever more automated manufacturing base, real jobs will become scarcer. This has been going on for some time and is simply accelerating all the time. At some point in the (probably not too distant) future almost all products will be produced by robots or by automated factories of some description. All raw materials will similarly be extracted/sourced by robots and transported automatically. All infrastructure will be built and maintained in a similar fashion.
And when that happens, money as we know it will become obsolete. I see UBI merely as a stop-gap measure along this path.
As for people, I think you also underestimate humanity's drive and curiosity. The vast majority of people would want to (and would be able to) do things that they enjoy as opposed to being forced into what is essentially modern day slavery for most employees.
For some people, their contribution to society will be artistic in nature. Imagine a future where anyone can submit a structurally viable design for a new bridge (for example) and have the local residents vote on the one they like the most before it is built. For others, who knows what possibilities the future could bring?
I used to make games for a living. I would like to do that some more - but with the knowledge that I'm not being ripped off and exploited by an industry that treats employees like shit. I would like to get better at carpentry. I would like to have the time to fix things on my house - maybe turn the land into something that resembles a garden. I would like to have the time to travel more. I want to have the time to socialise with my friends more. If I were born several hundred years from now, I might want to explore new worlds. Don't get me wrong, I also want to be able to enjoy my free time and party like crazy, but not all the time.
Of course some people will want to waste away their lives getting high and inspecting their navels. But if that's what they want to do, who are we to discourage that? ;)
Education shouldn't change too much I wouldn't have thought. Although if we had a fewer art-history majors that wouldn't be a bad thing.