How did the interstellar end at Saturn?

The purpose of NASA sending astronauts into wormholes to find new planets is actually to put those 5,000 fertilized eggs. It was the data sent back by Cooper that enabled humans to launch Saturn space station, and the food problem on earth has not been solved so far. New planets still need to be discovered. At the end of the film, the happy life of human beings in the space station is only a very short stage. In the long run, it is necessary to use the space station as a springboard, cross the wormhole and continue to look for a planet that can sustain life. Mainly because: the population that can live on the space station is very limited; Without planets, the space station cannot survive for a long time. In a short time, some people can live well in the space station, but the materials needed to build the spacecraft need to be collected from the planet. The food on the space station may be self-sufficient, but the energy problem is difficult to solve. There is only solar energy on the space station, unlike various methods of collecting energy on the planet. If the earth is completely uninhabitable before finding a new planet, the space station will not last long. In short, if we really want to reproduce, we must find a new planet. Solving the gravity formula only makes it easier for human beings to leave the earth, but does not solve the fundamental problem of no living space. So I am very puzzled by everyone's attitude that "happy life has begun" at the end of the film. Even if we find a habitable planet and start immigrating immediately, the fate of most people who are still on the earth is still not optimistic. Although it is easier to launch a spacecraft with the gravitational formula, we haven't thought of any method to improve the engine efficiency by applying the gravitational formula. With their engine technology, it takes two years to reach Saturn and five years to go to a new planet. Moreover, no matter how big the ship is, it will hold thousands of people, and there are billions of people on the earth. Even if each ship has 65438+100000 people, it needs at least 65438+100000 times. It feels like it takes decades or even hundreds of years to build ships and transport people every day on earth. Seeing the posture of the earth in the movie won't last for a few years. I think it is absolutely.