From what I have read, it seems Dan Brown isn't that good of an author anyway. Thousands of other writers could have written the story better than he did, if he had commissioned them to do so.
There are tons of excellent writers out there that would write "the Great American novel" if only they could figure out what to write about. So, it's not the execution but the great idea that is a more rare resource.
If it hadn't made money, and sat on the shelves today, would it still have been a great idea? We can really only tell looking backwards.
The same is with startups. The tools and tricks of marketing and execution are well known. They can be applied to any startup. But they cannot help every startup become a runaway hit. The idea behind the startup matters too.
There was a big plagiarism suit in England about this, so it's not the best example. Besides which, you will learn on your own that ideas are less important than realizing them. It's a hard lesson to learn and it took me many, many years to see it, You will too.