I think it will come down to the price of Natural Gas, relative to oil.
actually I misread your post here.
The USA could already be a natural gas exporter if the laws and the export facilities were available for it. Those are both in the works.
I’m not real eager for exports to begin because that will put further price pressure upwards on natural gas and thereby dampen the enthusiasm for natural gas trucks and buses—not to mention a 100 billion or so worth of industries showing up on US shores to take advantage of lower natural gas prices.