My two youngest, 7 and 9, turn on my machine the most out of my five kids. It's a theme they have zero interest in, but love the lights and sounds.
I say theme doesn't matter much in the end as long as it's a good game. We would talk about 24, the pin, if it was a solid game. There are plenty of failed/bad movies that had good pins that get talked about.
In 30 years the NIB buyers will be demanding Ready Player 1 and The Hunger Games be made at that future time.