certain things are essential to continued existence. Those are genuine needs.
Things like shelter, food, and protection from predators. (which in the modern world, includes financial/legal ones, which have replaced the natural ones.)
Wanting something that is not essential to continued existence is a genuine want, not a need. Things like "better" housing, or "better" food.
When nobody is working, they do not get the universal exchange medium (Money, because their only real commodity worth value, labor, now is worth precisely 0$), and thus cannot even secure for themselves the essential required materials needed for continued existence.
Their neighbors will likewise not have access to the required materials needed for continued existence. The eventual reality will dawn on them, that rather than procure those needed materials from the people who can produce it for free, (using robotic labor), they can procure it from each other, by treating each other's labor as valuable, and assigning a new currency system that respects this. (Or even, trading things with each other in exchange for the risk/action of stealing it from those that can produce it for free, which is then still a labor that has real value, just not to those who own the machines, and have all the money-- and applying an exchange system based on that risk.)
Either way, it will end up with the same eventuality.
Those able to produce it for free, who refuse to provide for free (post scarcity), or allow free access to the exchange medium (Basic income), will only end up without a market to distribute to or produce product for. The value of owning the robots vanishes.
The reality that humans need a place to live, food to eat, water to drink, etc-- will not go away after human labor becomes obsolete. Thus, the humans in question will continue to have those needs, without a viable way to obtain them from the economic system, because they have NOTHING of value to exchange for them.