I think that it has to get worse before it gets better. I want to be sunny and optimistic and believe that thoughtful, peaceful, democratic reforms will happen and that people will get what they want from their defenders. But I don't see it happening. I see small-town police forces with armored personnel carriers, bored SWAT teams being called in because someone needs to use their existing budget to justify a bigger one next year/election cycle.
Do these people who you confidently say won't get justice go to the press? Do they call the DA's office, get out and advocate and protest, talk to their reps, etc? Or do they tweet about it?
I would bet SOME do, and I bet their DA will pander to get them off the phone, ignore complaints and drop all charges against police officers or leave it to Internal Affairs to deal with, so that a cop gets a few months of paid leave, and when no satisfactory (To the department) answer/punishment can be decided, said officer will be back on the streets, maybe in a different part of his jurisdiction, maybe not.
Who watches the guardians? Who ensures the guardians commit no sins?