Having gone last year for the first time in my life and at very high financial costs, I can tell you that blocking the path near the end of my massive journey from Philadelphia to Black Rock City would not arouse any sympathy to their cause. I don't care what the cause is. I was already livid by the time I crossed where it appears the protestors sat because of all the other things that I couldn't find anyone to blame on.
This whole blocking traffic protest trend only arouses hatred to both the protestors and their cause in all instances and it is not something Gandhi or MLK did because there is nothing linking what their method of protest to what they say they want to achieve. Protestors did it in Philadelphia, too, to protest some nazi-sympathizing group speaking and all it did is make every inconvenienced driver that learned what happened much more nazi-sympathetic. That's how it works. That's why you don't hear about famous non-violent icons doing this crap.