If the American public weren't so stupid and apathetic, it would never have gotten to the point where it is now, so I don't expect anything to change any time soon. The fact that the public are currently told where they can demonstrate, and the fact that this area is already over a mile away from the White House or the Capitol Building, is bothersome. I guess that American public was sold on this in the interests of "security" for their politicians. I'm not sure citizens of other countries would be so willing to be told where they can and can't demonstrate. I can't see Americans fighting very hard for this right, considering all the other basic rights they willingly concede on a regular basis.
For comparison, here is a picture of our Parliamentary buildings in NZ. Because we are not stupid, we recognise that this is public land, owned by the people and NOT the politicians. As such, we are allowed almost anywhere we want on this property, and demonstrations are regularly held on the steps of this building.