This is my biggest concern with the idea, which I don't see being addressed (checked the entire conversation on this post to date). I don't think having the vote and having the basic income is compatible with each other. Why aren't people going to vote themselves larger basic incomes every year? How can you both have the (modern conception of the) vote, and a basic income at the same time?
Attempts to answer this question also need to deal with human beings as they are, not as they could be if we were all just really good and pure and all motivated by selfless interest only in the good of humanity as a whole or something, because presumably this is being proposed as a real policy for real people and not some fantasyland.
(Also, I do not consider "well we already have some programs like that today" to be a defense... I'm not entirely convinced that's just going to turn out peachy keen in the end either. I'm personally pretty convinced we've already passed a threshold at which a significant chunk of our government is actively pursuing government dependency as a conscious policy, and that's not going to end well either, as the same mechanics take sway... there is always a reason to grow benefits, it's always evil to cut them, and there's no feasible way to bound the growth of promised benefits to real growth, other than the really, really hard one of simply running out of resources.)
While this is a criticism of mine, and I am not trying to hide my general skepticism as seen in my second paragraph, I am posting this also in a genuine spirit of inquiry about what answers to this question may have been developed. I acknowledge the problems the BI idea is trying to solve, and I acknowledge that I have no answers (including, alas, BI, unless someone can convince me here).