Building models has been a hobby for at least 4000 years. Yes, we love our subjects, and the 20th Century gave most of us the stuff we love to model. That's the key, this hobby has been around since the Egyptians, and if there are history buffs around as well, nudge wink, many societies before them had many guys like us around as well - we've been around almost forever. This hobby is no where near dead. We merely collect cultural memories, and make material 'phenotypes' to represent our experiences of the ethos in which we lived. Ahem, our culture is in our genes.