"Once everything is in place, I will never change it."
Unfortunately or fortunately, life is not stagnant. With the flux of life circumstances (birth of a child, job move, elderly parent requiring care, etc.) a home needs to evolve with the needs of the moment. Sometimes an addition is in order, other times a simple re-arranging of furniture is all that is required.
Even in rare situations of life maintaining balance and a steady course, design trends change rapidly. Staying current may not entail a home overhaul, but incorporating a few new accessories or painting a given area can produce dramatic results. An adaptable home is a worthwhile investment, as it supports various seasons of life.
