Yes. Plan A did succeed. By solving the gravity issue, Murph was able to figure how to get the underground space station off Earth. And with it however many people from the planet could go with. However unlikely that may seem
Also the movie ended on a note of hope. Dr. Brand did continue on to Edmund's planet and in the final sequences it was seen that there was breathable atmosphere. She had set up camp. And now Coop was on his way to join her. Real hope there. The beginnings of a human colony on a habitable planet somewhere across the universe.
On the second viewing the events within the Tesseract made more sense.
Also, your comments regarding the message of love and human emotion became more clear. In the movie it was those aspects that worked to motivate Murph into doing her part.
From the beginnings of the movie it was clear that Earth was to be abandoned. The question was what would happen to the human population of Earth. I can't say the movie fully addresses this at the conclusion, or maybe I missed that too.
-Steve
