There should never be a percentage that tips the scale. If 1% of native americans feel that they are being humiliated by the term Redskin then they need to get out in front of the issue and be the face.
Harry Reid is the wrong front man for your argument. Ray Harbriter, billionaire casino owner, is the wrong front man for your argument. This whole thing screams of a back room government power grab. Put the NFL on thin ice and gain negotiating power on dozens of other issues with $$ involved.
To me the real tragedy is that if there is real anger and embarrassment over the name then the small percentage of native american are too late to be taken seriously. The rational public knows when something smells like bull from the beginning and it never comes out of their nostrils.