The success of the protest is measured in the amount and type of discussion it generated. Because it is a LOSER topic for the hegemonic paradigm - all discussion of it is positive - even yours.
Prior to Kaepernick's PEACEFUL, PRINCIPLED, and NON-VIOLENT protest-The only way the news would cover this issue was with images of angry black mobs, and images of burning and looting. Or police clubbing protestors - because their peaceful assemblies were declared 'unlawful', for instance.
While the anger being expressed is justified - it was the sort of imagery that racists and supporters of an unjust system, just love.
The Rev. Dr. MLK Jr. (and NAACP, SNCC, SDS - et al) used similar tactics (to Kaepernick's) to oppose segregation and white supremacy. The images of the Watts riots (a reaction to unaccountable police violence, segregation and white supremacy) were something that he was trying to prevent, by his principled opposition - but which the system and media loved to broadcast, and conflate with it.
The tide is already begining to turn. In the intervening time - police have been charged (where appropriate) at a MUCH higher rate than in the past. Here in LA - the police attitude, procedures and messaging have all been undergoing a dramatic transformation. We are not yet where we need to be... But we have made positive strides and movement. The visible protest of Kaepernick, and those who've joined him in opposition have drawn light to the issue. They have also drawn HEAT - from both overt and unconscious racists. That the President of the US Government has been drawn into the fray - is a success. Sure he advocates suppression of 1st Amendment protected free-speech, blacklisting and violence...but when doesn't he do that? It has exposed him and his supporters for who and WHAT they are. That is a victory. Kaepernick has sacrificed at least 1 year of his career - while still in his physical prime. That is plenty of sacrifice to ask of anyone. In that he is similar in his principled stand to Muhammad Ali - who gave up his belt (and was threatened with jail) over his stand against the US' war in Vietnam. At the time he was attacked. Now he is well regarded. Same with Kaepernick. Two years ago in SD, (alleged - SD) ChargersFans shouted and jeered at Kaep - while members of all four branches of the US military attempted to block view of his protest - with a WHITE sheet...1observer pointed out that such action is usually taken by people WEARING white sheets.