(Regarding the news that the Thai government wants to recruit thousands more foreign teachers) I sincerely believe that the issue isn't just one of pay. Of course, professionally qualified native English speakers demand high pay, but that's not what 95% of Thai schools actually need. You don't hire chefs at MacDonald's.
More (and better) people willing to teach would be lured to Thailand AND STAY LONGER if the conditions were changed. And there are many ways this could be done. Offering a path to citizenship, reducing the ridiculous red tape and expenses, having government-approved contracts covering hours and pay, etc, offering health and accident insurance... the list goes on. Despite what you may have heard from one government official, there are no serious, meaningful attempts to recruit able 'teachers' from abroad - and there never will be.