I'd very much expect most authors that focus on literature rather than short-form paid-by-the-word non-fiction-work to fail or only receive a minority of their income from writing.

Becoming a writer to make money off literature is pretty much like playing the lottery - the odds are badly stacked against you; if you have "success" most of the time you'll make a pittance, and only a tiny proportion of the people who are successful make it big.

If anything, current incentive structures created by current copyright are bad for most people in the creative fields, as the "hit culture" means they're heavily geared towards disproportionally rewarding a very small subset of people. While the hope of striking it big may lure some people to create, I'm more concerned that the bad odds of being able to make ends meet puts a lot of very creative people off those career choices.