We'll have to.
Some say we have a problem of ever increasing efficiency of machines and their obvious continued impact on the vulnerable resource "hierarchy", but others say that's not the problem, but the distribution of resources, the hierarchy itself, which is what you seem to think. It seems you see a problem of ever increasing division based on wealth and you see it lead to the poor eating the rich and vice versa;
UBI could work for now, as a temporary solution to soften the effects of the current pandemic and any other future economic disruptions. But it should be fought tooth and nail as a permanent "solution" to unemployment.
The reality, UBI has been tried, tested in numerous communities. You seem to think that ubi hasn't been tried, hasn't been studied for over half a century. Poverty isn't around because "workers don't own the machines" and if you were to define Capitalists in your "future where workers own the machines because they made them" it would be the people who own the minerals and raw material because they Own It, and not necessarily those that extract it, and obviously
the ones who make money through ownership of capital
vs
the ones who make money through labor
Which will obviously be The Workers who Boss the Machines, the few that "own machines because they made them, because" which can only exist in a utopia where the resources for making machines and incentives to do so are entirely intrinsic to such a reality, where machine parts just manifest for workers to assemble, or that resources for machine parts just manifest and that workers just yearn to turn them into machine parts, and society is based entirely around machines.
How many workers do you think Make Machines for someone else?
How many of those workers could Live because they own whatever machine they made?
It doesn't matter, because we aren't part of such a reality. In our reality, one machine displaces thousands of workers as will ever increasing efficiency continue to do so, and nobody is "entitled" to own something simply because they assemble it. It seems, getting paid for making machines doesn't cut it, you're entitled to the machines themselves, heck, fuck private property, those capitalists don't have to work, exactly like the future where machines are assembled by workers that own them, who don't work, but build machines as a hobby..
I know.
No, I don't.
That's obvious.
Of course not.
Indeed.
Workers do more than just "make machines". I really don't know what you're trying to say; you make no sense at all. It's not so hard a point this post makes: as long as the means of production, whatever they may be, are in the hands of a few individuals, the underlying problems that caused the circumstances under which a UBI seems like a reasonable solution will not be solved and the gap between rich and poor will grow.