The current world has changed a great deal since some of the congresspeople were elected. Changing views, new technologies, many ways in which the world has adapted. Many congressmen and women have been in their seats for too long and as such cannot relate quite as much to the opinions and stances of many of the younger generation today.
One of the reasons that very few people actually approve of Congress is because they are almost entirely comprised of people with socially conservative viewpoints, even though the country itself is socially liberal/progressive. Therefore I feel that once the current generation of people becomes elected as Congressmen/women, there will be a much faster wave of socially progressive equality related bills getting passed.
Every generation before us believed that congress would be much more appreciated once their generation became significantly elected into either the House or the Senate or both. Let y(x) = the number of people of a certain generation, and x be the age that generation is. Let y(x0) be the limit as x0->0, and y(xi) be the limit as xi-> the age in which we die, so let's say around 120. It does not matter. Irrelevant. Because the y(x0) is always > 0, we are assuming, unless everyone decides to not have babies and no immigration or anything that makes more people, then there is always a generation that will not appreciate Congress. Find the double integral of the y(x) function over the area of the United States of America, and voila. Your answer.