Basic income is welfare 2.0. It's not going to lead to human happiness.
The economy itself is an "actor" on this stage. It's going to make choices about who can afford what. It's going to reward those who reduce inefficiency, those who find new growth paths, and if not that, it will build reserves to help it through lean times.
In that system, people who don't "add value" are a carrying cost, and the system will try and reduce them.
The system we have, can not be expected to spend its surplus generously, or happily.
I'm not sure I follow, what are the reserves? If we are talking about the entire economy as an actor, a number in some magnetic tape can't be. Neither can be food or infrastructure unless it is properly preserved. So my guess is that the right reserve would be a people. People that aren't adding value today, are excess capacity that can be used during bad times. Guaranteed income is one way of maintaining that extra capacity.
Also, I'm not sure that anthropomorphizing the economy, while interesting, is the right level to think about this.
