If the options are declaring open season and not doing anything, you are correct that open season may be better (I say may because I do not know about feral pig

If the options are declaring open season and not doing anything, you are correct that open season may be better (I say may because I do not know about feral pigs breeding patterns, etc. For example, some animals do not breed when they have a young child, so separating them from their children will have an opposite effect). But there is a third option that is better than both and that is having professionals do the eradication.