Basic income might make it reasonable to eliminate TANF, some portion of SNAP, and some unemployment, but it doesn't eliminate the core need for Medicare and Medicaid.

In the basic income scenario outlined, the poor and the elderly will still need subsidized health insurance (assuming the current employer-provided health insurance model) or health coverage of some sort.

Social Security is also something of a dicey proposition. While it would be possible to use basic income to reduce social security benefits, it's role as a social insurance scheme to provide for the elderly couldn't be substituted in its entirety by simple basic income. Social security disability and death benefits would also need some more thought.