I used to think a universal basic income would make sense, especially in developed countries, only for the near future scenario of machines taking ever more jobs. We know that this has always happened in history, and new jobs were always created, but that doesn't mean that the rate of job creation vs destruction will remain the same, forever. What made me change my mind about UBI was to realize that a) human desires…
The reasoning you're using is very flawed. Yes, we'll never get to a state where a small number end up with 100% of the wealth. Yes, there will be an equilibrium reached between the wealthy and the middle class. But this equilibrium point can shift more and more towards the wealthy. In fact, this has already been happening in the past few decades, as illustrated in books such as Capital. And as this equilibrium shift…
It's already kind of happening with startups; to a significant extent, startups are essentially luxury goods for the super-rich. They've become a collectible/status symbol. Like a yacht or a private jet. Wealthy investors love to brag about all their big exits.