What are the facets of Martin Luther King, Jr.’s dream? Are these realistic or idealistic? Can they be accomplished?

Dr. King advocated for nonviolent responses to police brutality. In the wake of the killing of George Floyd, Michael Brown, and other acts of police brutality, what might Dr. King advise? What would he say in a speech on the subject?

In what ways is “I Have a Dream” a speech for a specific time and place, and in what ways is it universal? Does reading it more than a half century later change its meaning and if so, how?