We'll never have a ubi in a opportunistic greed based economy. How are you going to convince "mr i want all the resources" that they should share for the wellbeing of other people (and indirectly for the benefit of themselves but they dont look that far)? its about the foundations our economic systems are built on.

edit: oh and without sounding too conspiratorial hopefully... how are you going to control a populace that isnt desperate, downtrodden and uneducated... /end conspiracy