Currently, there is probably more to be gained by the family, and others who glom off the MLK legacy by perpetuating the “sainthood” myth. Among other honors, it got their family member a memorial statue on the Washington Mall.
As the present generations fade, race-baiting becomes less lucrative, and the cash flow at the MLK Foundation slows, look for books and biopics to surface about MLK, the man.
It probably won’t happen in my lifetime, but eventually the pigeons will poop and the truth will out.