They need to release Part 3 in 3-D. Bootlegs for alternating field (LCD shutter systems) sell constantly on eBay, and a real one would go over even better because it wouldn't be an nth generation bootleg.
If I were Paramount, I'd digitize 3 and get it out on digital 3-D screens for Halloween. You haven't seen it if you haven't seen it in 3-D, and it'd cost them about nothing to do a digital theatrical release.