Desperation sparks innovation though. As the demand for production and transformation increase and the current means of powering such things decreases, the necessity to use alternate means increases and it becomes economically feasible to focus money on research for these alternate energy resources.
That's really where the heart of it all is. We rely on non-renewable resources, not because there are not alternates, but because the necessary funds haven't been funneled to those research outlets to further develop these alternates. Once those non-renewable resources are too expensive to continue exploiting, well then I'm sure we'll see new means. The same goes with every industry really, not just fuel. As we consume the resources that aren't renewable, it'll become increasingly important for industry to start using renewable/recyclable materials.
Whether or not they will do so enough to match the size of the global populations imprint on this planet, who knows.