The German Game of the Year award nominees and "highly recommended" games average only 30 minutes playing time, though many are for more than two players. And all are difficulty 1 or 2 (max is 4).
What does this say about where game design is going?
I ran across the Kennerspiel (which I'd never heard of, and which goes back just a few years) after posting.
No, I don't play family games, never have.
Quote: "I am have an impressions that it does not matter if a game is good or bad anymore, the only thing that matters if it works. It should then be able to entertain people."
Most younger tabletop gamers (in my experience, at any rate) also play video games. And a great many video games amount to time-killing. (Jakob Nielsen pointed out that the "killer app" in mobile was killing time.) Perhaps time-killing is more common in tabletop games now, meaning if a game works, it can be used to kill time. It's not really entertainment, though; the other players are the entertainment, in this case.