The LBJ Presidential Library in Austin, Texas recently convened a Civil Rights Summit to celebrate the 50th anniversary of the historic Civil Rights Act of 1964. Yet no one at the summit raised the most obvious question: is the old Civil Rights Act still necessary in this day and age? If so, why? Would you expect the level of racial, religious, or gender discrimination to go up, go down, or stay the same if this 50 year-old law were repealed tomorrow? (As an aside, does the existence of discrimination refute either the rational actor model of economics or the main tenets of the Coase Theorem?)
So is it time to repeal the 1964 Civil Rights Act? If not now, when?
prior probability 
It is still necessary because racism and prejudice still exists. The level of discrimination would definitely go up.
By the way LBJ was a racist himself
http://bossip.com/946108/civil-rights-hero-racist-lyndon-b-johnson-was-a-connoisseur-the-word-nr-who-helped-pass-the-nr-bill/