While stuck in the black hole today, I read this piece on talent versus hard work. Which is more important for a writer? Well, I'm no scientist, unlike the guys in the article. BUT, here's my ten cents.
You can be a supremely talented writer who hardly ever writes anything - and you'll be a supremely talented, unproduced writer. And you can be a not-so talented writer who works your ass off, and maybe actually get something made. In that competition, my money would be on the hard worker. Apart from anything else, writing is something you can get better at through lots of practice.
It's like Malcolm Gladwell says in Outliers: people who excel in a field are those who put in 10,000 hours of work. Would Mozart have been Mozart if he hadn't practiced for 8 hours a day, every day? Put the work in.
As Oliver Stone's sign above his chair reads, Writing Equals Ass Plus Chair....