Owning a china cabinet in this modern age is a traditionalist, vintage statement. Often the south is more inclined to own them because of the old-fashioned decor trend due to overwhelmingly conservative attitudes. Built-in kitchen storage or cabinetry is more practical and easier to manage than the traditional fixture. Families do not use china often because it is a luxury item that no one wants to risk getting tarnished. Frequent, large family gatherings are not a staple of every American family. Frankly, who would want to wash all those dishes?
Google a phrase akin to "are china cabinets in style?" These are not academic articles for the most part, but they are popular sites that discuss design trends over the past century, and an analytical mind can investigate their claims.