I disagree, I think any person of average intelligence and talent can become at least a National Master with enough hard work. Once you reach higher master titles though, such as IM and GM, I think talent becomes much more critical.
Since I'm nowhere near master, I could be wrong and have no idea what I'm talking about. It would be nice if some masters shared their opinions.
Without the requisite talent mastership will forever remain out of your reach. Maybe you'll be an anonymous club player some place. Somethings no matter how bad you want you will still never have because you dont have what it takes.