In the future we probably won't tour as many months out of the year. You start thinking about all the things you want to do in your life and realize you don't have unlimited time. We're at a point where we need to make serious decisions about how we want to live.
When you start talking about why something happened or why it was done a certain way on a project, they have the answer because they were there when the plan was made, ... That is a lot of history involved in these departments and we can never replace all of it.