Sol Campbell had a point when he noted that UEFA could have made a much greater effort to get the host nations to tackle racism, they've basically ignored it yet doubtless have given a laundry list of conditions that have to be met for sponsors etc. If that's not an example of misplaced priorities then I'm not sure what is.
If there is racist abuse then I hope the players will walk off irrespective of the yellow cards they will receive. Sport can and should be used as a method to highlight the unacceptability of certain behaviours.
It would be good if the team walked off the pitch with the player that is being abused.