Why would you hope that seeking out alternate fuels stops? Its not even an option anymore. There is a finite supply of oil, and with this new "greener and friendlier earth" we are attempting to reduce the amount of damage we do to it. Will oil always be needed? Probably in all of our lifetimes, but there will be other generations besides us that will have to deal with the damage we do to our planet.

That being said you should think about it this way, if we develop cheaper cleaner energy sources that run everything from heating systems to cars to public transportation what will happen to the price of oil? It will drop significantly. Supply and demand pure and simple. Airplanes are probably 15 to 20 years behind cars when it comes to using alternative fuels, but if the price of oil were cut in half because most of the world didn't need it I think the airline industry would be just fine...