The automobile is the big fossil fuel consumption thing. For now.
The military uses fossil fuel, but will a fleet of autonomous electric powered drones be the future? The chemicals to make wind turbine blades and high performance composites, and explosives, will remain a narrowed niche market. But burning it instead of using it as a raw material for manufactured goods may end. Sooner rather than later might be best.
Heating homes with solar conversion methods is real, now. Energy neutral construction is not a distant fiction. Green homes will happen.
When renewable energy is established, the Saudi attention will wane. Who'll care?
UPDATE: Boeing is buying in to the alternative fossil-fuel-free concept. While much can be said pro and con per Boeing it is not one to chase pipe dreams.