Whatever the economic effect, I have a hard time imagining the political class giving up the power that comes from being the middle men between dispersed costs and concentrated benefits.
I have two concerns: the first is basically the one you identified: welfare and similar programs are less about helping people and more about keeping a large voting block in a state of dependency. I'm not sure the alternative of basic income changes that, it might actually increase it since more people would be getting basic income than are currently getting welfare and other forms of assistance. Any program which en…
I think the idea is that the money would be transferred using taxes, not printed.
So what would happen is that the basic income would become the new zero line.
How? Even if you did print the money, you'd devalue all of it, not just the new amount. If a dollar from the basic income is worth $0, then all dollars are worth $0, unless it was somehow printed in non-fungible currency.
Of course, the inflation would probably affect some prices more than others, but I don't see how could it ever turn the basic income into zero income.