The whole simple answer of why isn't the "experiment" working is that the "Rehabilitation Act" as it was called at the time was ALL about FARMING. It was never meant to be a "buy tutu a condo in Kona program". Its business model was designed to generate income that would be passed along to fund new homesteads. Because it has morphed into a HOUSING program, the business model and so the income, has not been generated. The program has become a black hole where money goes in and never comes out.
The banner above says, "With thousands of Hawaiians waiting, Home Lands agency produced no homes".  The short answer is it WAS NEVER MEANT TO.