A playground. A showcase. An investment. Whatever your kitchen is to you, it's always right to design it as a personal statement - whether you'll be there for a year, ten years, or who-knows-how-long.
A kitchen can be designed to accommodate life's changes - whatever they may turn out to be. Will this be a kitchen to grow old in, or to keep in good shape until a realtor is needed? Doesn't matter: a great kitchen is a kitchen that improve the life lived there.