Something I have realized over time is that you really get very few chances to be a part of something from the beginning.
For example - I have worked with two volleyball programs, St. Kates and Hamline University where I was either in on the very early years or the very beginning of a new regime with a new coaching staff, players, etc. What is so important about this? At the beginning you get to help shape an organizational culture.
The ethos - how things work - what is ok, what is not ok - what do we value - where are we headed.
Now, you might argue you can change and shape these things at any point in an organizations time, and you can, but it is nothing like the beginning.
Now, if you stay long enough in an organization you can affect change and help change culture, but it is much easier at the beginning.
I am excited about shaping culture, I am excited about the new while staying faithful to the current.