It's a simple supply/demand thing. If there are more hunters than pig damage, the hunters will end up paying. If there is more pig damage than hunters, the property owners will be thrilled to let you hunt for free. Of course, it is more likely that the government will get involved and none of the preceding will be correct while it costs the taxpayers, hunters and property owners much more than it would have otherwise.
Lived in Texas for several years, I don't share your optimism. You couldn't throw a rock and not hit a farmer/rancher down there who wasn't complaining about the damage the hogs were doing. You also couldn't find one who didn't want to charge people to allow them to hunt.