My opinion is that the greenhouse gas benefit of exporting LNG is transitory. You're absolutely right that burning gas is less emissions-intensive than burning coal. However, I have not seen a very long-term study—to mid-century—in which the world is trending towards very deep greenhouse gas reductions along with a large or growing role for natural gas in any energy system. It's going to have a supporting role that's probably going to dwindle over the years.
I don't think LNG has a very strong role in supporting the transition to clean energy.