Which route will give the auto industry its best chance of survival?

The U.S. auto industry is in turmoil, it has spent too many years building inefficient vehicles. Which route will give the auto industry its best chance of survival as the gasoline supply starts to dry up: hybrids, natural gas, hydrogen, fuel cells, electric, steam ? Explain your answer.

When will the hydrogen driven cars would be accepted globally? without any oil driven vehicle on road.?

The automotive emmision & the natural gas crisis is being so severe globally. Though fuel cell cars are running on road they should be replace the old oil driven vehicles soon to protect the environment. When that time would come when all vehicles running on road would be purely pollution free.