Minimum wage is barely (in many cases not even barely) enough to live on. Raising minimum wage is a herculean task that rarely succeeds. Federal minimum wage hasn't been raised in 16 years. But we'll have not only a livable UBI in 20 years, but one that's enough to "retire to a life of leisure"?

Doubt.

We can't even get universal health care or a decent minimum wage through the opposition from our oligarchs, and those are much, much smaller asks than UBI. Why on earth would you expect UBI to be possible, never mind inevitable?