My feelings are that if the basic income is not enough to cover the same privilege that the older generations have of home ownership and a pension covered lifestyle (food security, housing security, medical security) then it is not basic.
And also that if it was only given to some at a sliding scale, it is not universal.
what counts as "basic" will continually shift towards more and more.
I dont believe basic income is possible until the day humanity discover a source of limitless energy cheaply obtainable.
Someone will say their brand of limitless energy is better than the competition, it’s human nature