If they haven't removed the perverse incentive not to work that was the entire problem with welfare payments to begin with, then this is not really a Citizen's Dividend. In order to be that, it has to be given blind to income, education level, social status etc. We did welfare payments before and decided they are a bad idea, so I'm not sure what these "experiments" are aiming to prove. Also, Swede is right - it will only be effective if it's permanent.
The fact remains, though, that until we get rid of birthright citizenship and get control over immigration, the Citizen's Dividend will be nothing more than a pipe dream in the U.S.