Both models have problems. The current capitalist model is dead in the long run as automation deprecates more and more jobs. On the other hand, the RBU model is really naive in thinking people will be happy to not have an advantage over others (being in a privileged position if you have a lot of money, this would disappear in a RBU). We'll see how things develop, the future is extremely blurry.
Technically all jobs in the service sector can disappeared in one day because of computers and automation. So
the capitalism is allmost dead. They keep it alive with mechanical support...
No need to keep it alive. 50 years ago we had industrial capitalism (since 1800s), now we have financial capitalism, where you pretty much don't work but mostly invest (or just speculate, lol)...
You may question its benefits or its overall virtues in general but not its existence