I've had the odd good luck of starting slowly and building gradually, something few writers are allowed anymore. As a result I've seen each of my books called the breakthrough. And each was, in its way. ↗
I think the more avenues that open up when people want to publish, the better. Some of the authors that want to jump ship from the traditional houses and go on their own, you know what? Good luck. It's going to be a lot tougher than you think. ↗