This question has probably been asked many times, but here goes, is there a market for them other than hunting, can they be taken to a slaughter house live, and sold to them?
I haven't done it, but believe there are a few folks who will take trapped hogs for slaughter. I've seen an ad somewhere, or maybe a website, but can't remember. I have no experience, but would think this would be a challenging way to run a business, because there is no control of inventory for planning, budgeting, etc. I also remember somewhere that one of these business was kind of hit or miss - sometimes they would accept hogs, and sometimes not based on time/space.
Like others have said, I don't ever see a way to eradicate, but do think some control could be found if there was a concentrated effort by the state, landowners, and hunters. Maybe a subsidized trapping program for landowners, and a controlled hub and spoke system for slaughter - drop off regionally and then they go to a central location for processing. With the amount of damage they can do, it would seem to me that a program of this kind could be made cost-effective.
The way things are now, it is not viable that enough hogs can be hunted or trapped to make any real impact in the populations.