Change is risk. When you decide to make a change, it will cause other things to change. Sometimes in predictable ways, sometimes in unexpected ways. The unexpected can range from wonderful, pleasant surprises to the "shit hitting the fan" surprises. We usually chose to make changes for the better...but with that always comes the possibility that things won't work out the way you thought they would. Then it's the "shit hitting the fan".
Excuse me, I have to go try to clean up.