GM claims it will be all electric by 2035 for cars and light trucks. Maybe they don't, but they will be heavily electric. That is potentially a lot of cars, and a lot less gasoline being burned. It may require a lot more NG to be burned of course.
I think demand for oil is headed down longer term. We could be awash in the stuff in 15 years with much less demand. That would be an ironic version of "Peak Oil".