No, I would probably not want to colonize another planet and not go back to earth. I find it bittersweet that people are now realizing how much the earth means to them. They have not properly segregated their trash for a long time and they have also invented items that have contributed to the type of earth that we have right now.
The earth is encountering a lot of problems and it is the fault of people. Even the other animals are affected because of what the people are doing and they have the right to feel mad whenever they are attacked. The earth is a wonderful place and it may still be saved.
No, I would never join a mission to colonize another planet if it meant never returning to Earth. Although the idea is fun, challenging and thrilling, I would never trade the life I have here with a brand-new start in another planet. This is because I have a career that I love here, and leaving Earth would mean one thing: I would also lose the job I worked hard for to get.
If I have a wife and children, I would never leave them behind because they all need me to support them with their everyday lives. It is worthy to note that this answer is based entirely on my own opinion. Other people are free to choose if they want to leave Earth and never return.