They are not useless. the majority of americans have no clue about even the term 'emminant domain" let alone its implications. Demonstrations would be educational and at this point very very helpful.
Having said that, why would anyone care? I mean Americans have to be consumed with the latest celebrity romances, they certainly don't have time for anything like this.ha.
They are not useless if people do it. The problem is that you advertise a protest, and 35 people show up... That ain't gonna do anything, except tell the Supremes that they got away with another one.
Now if there were half a million, then that might make a difference.