With Thailand's aging population, along with a stronger economy, the young (younger) Thai boys are finding it easier to find respectable jobs, thus the reason we probably won't see many working the bar scenes in the future.
Thailand needs more construction and manufacturing immigrants NOW...and if they were smart (that's a big if) they would make it easier for immigrants from Myanmar and Laos to obtain long-term work visa's. This of course would help the working-boy supply line as well.