Many of us are continually looking for that next hill to climb. That's what makes the hobby both challenging and fun. From your comments, most of you agree with this.
Whenever I spend time at the layout, I am re-evaluating what we have done. There are areas like the winter scene portion of the layout that I believe I got it right the first time and would not consider a change. What we redid a couple of years ago, I also like. However, fortunately, there is real estate left that could change for the better. That keeps the hobby fresh.