I do agree that "we all have our social imagination as we are all capable to invent visions what should and might be." The root of the question is really whether not human nature encompasses creativity. To this question, the answer is an obvious yes. However, the capacity of each individual's imagination has limitations. One person can be more creative than another. We all seem to want a better society, but our solutions differ in the capacity of our creativity. Like beauty and aesthetics, an ideal society is subjective. Therefore, our solutions differ, but we all have solutions. The spectrum of our solutions itself is beauty because of its wide range. Honestly, to not think of solutions for a broken society would be ignorant and egocentric. It is the beauty of our ability that becomes a useful power in our troubled world. The next step in imagining solutions is to act upon them. The power of action becomes a more useful tool as it allows creativity to come to life. With proper determination, we all have the same capacity to let our visions be heard and possibly come true. Action becomes the boundary between dreamers and activists. Activists see their dreams become reality, and it is activists who truly change the world. We cannot all be activists, as solutions will contradict each other. Further, activists may change the world for the worse. It is unfortunate, but possible. Maybe dreamers are afraid to see their prized dream become a broken reality.
In literature for example, utopian societies are huge examples of social imagination that do indeed become broken realities. Through literature, we learn that social imagination only lasts for moments, until another group's social imagery becomes more prominent or powerful in the time frame. In the hunger games, the system of 12 districts and one almighty capitol. It works for 75 years, until the unrest of the people conceives a new vision for the well being of society.
In divergent, the faction system works until one faction in visions a society controlled only by them. This example also proves the point that with social imagination, everybody thinks his image is right. Maybe, if everybody worked to build upon each others image, a collective social imagination would prevail.
To reinforce, we all do have social imagination, and we all can have opinions about what should be. With that said, however, "should be" doesn't truly exist as everything shifts with the time and ever changing society.