It seems to me that creeping casual'ness' & the lack of will to put in great effort are the culprits
People don't seem to want to trouble themselves anymore. And they make lots of excuses for not doing one thing and another and how busy they are. I think I mentioned a couple of months ago that I believe we are becoming quite lazy. Seems to me that if we are willing to go to the trouble, we make the time. Like Richard. Well, maybe he's an extreme example.
H & I used to have lots of big and formal, 7-course dinners. Yes, the good crystal, formal china, good barware, silver this and that, all came out. Even in the Caribbean, it was a good time with lots of effort and the good stuff. So I lost a day or two on the beach, but it was still a good time. And people did enjoy themselves. It's tough for me even to imagine doing all that and playing host by myself now but I'm going to try it with 6 people this month (I think...that's not quite a commitment) and that will be a challenge in my little place.
The west coast is really informal in comparison. We lived in a big sophisticated metropolis, but here, life is very different. Don't you feel silly sitting down to the formal china and fine crystal in your bluejeans? Should we? Or should we just yank out the kitchen stuff because you know most people will be casual? The one exception is Christmas or New Years...that season. You may just be asking about the dinner and the number of guests but the article seems to the lack of formality now as well.
My 2 pennies worth.