As well I think for established people with kids and other commitments 1000 isn't nearly enough to get by but there is a real danger that for young adults you give them this option of completely checking out of society if it's available forever. Rent a cheap house with friends, smoke weed, and play videogames sounds like a pretty decent option to a lot of 18 year olds. Or even younger maybe? When can kids legally drop out of high school?
I really think basic income is a bad idea. I don't think we are anywhere near the point of mass replacement of the entire workforce with robots/ai even in the developed world. Forcing people who are working to pay into a system that lets people contribute 0 to society while enjoying a decent life(24k for a couple/roomates is completely livable in many parts of US especially without a car) is both unfair and likely to cause significant social strife between workers/non-workers.
I really think a basic livable wage with the removal of the minimum wage is a far better solution. Set some minimum livable wage based on 40 hour work week and have the government top up wages rather than incomes. Obviously there would have to be some sort of progressive claw back system to encourage people to find better paying jobs and not just go with the easiest thing available. Maybe have the government act as an employer of last resort creating some busy work cleaning streets or repairing roads.
I really think it's important for people to have something to do when they wake up in the morning and to be contributing members of society. Not only out of a sense of fairness for the people that are working but I think it is incredibly unhealthy to not have any responsibilities in life.