At least one LCC, AirAsia, has been saying that they are concerned about their operating costs being too high at the new BKK and that they think Don Maung should be re-opened as a LCC facility. I don't think it will happen; there have been plans announced for a new LCC terminal at Suvarnabhumi, and other interests have their eyes on developing Don Muang. Emulation of many things Singaporean seems in vogue at the moment, so expect the LCC terminal at Suvarnabhumi will win out. (What is the situation at KUL, I think there may be a separate field for some LCC's?)