I always felt there were too many holes in the JW fantasy of paradise earth. Of course, as one of the above posters pointed out, the sun will certainly die and the earth itself will undergo changes. So, the JW teachings are simplistic and childlike and don't take into account anything scientific.
If there were to be a so-called new system anywhere, and if it were some almighty being's wish that the human race go on indefinitely, it makes perfect sense that humans populate the rest of the galaxy. So, I am with Finally-Free on this.