And when you hit both Original AND Good, you’re Golden...until the next ‘New Thing’ comes along. :)
The bestsellers certainly have to worry about that. In the sense that when Twilight came along, Harry Potter wasn’t that hot any more. But if you’re not in that league yet develop a loyal fan base, it’s less of an issue. I have one major advantage, which is that the agent I query really likes me and my work. He’s demurred so far on the basis of genre. That may not be an issue with the submission I mailed off this past Saturday. It’s in the most popular genre, plus he specifically requested it. So we shall see.