The next step after
Kelo is for some city or small village to try to take firearms and ammunition from residents under their power of eminent domain. Morton Grove, IL comes to mind as a test case. For example, Soros, et al could work out some deal whereby the village would profit by $10 or $25 or $50 per gun, and $0.05 per round of ammo, by selling them to a foundation or scrap metal company that he set up, and suddenly guns & ammo will be ripe for the taking since the "better use" for the village for those privately owned pieces of property would be to obtain them and then sell them for a profit to the entity that was set up. Even better (from this point of view) would be if the profits were to be used for some municipal function that was public without any dispute (e.g. finishing or improving a local road). Never fear (or, fear GREATLY), some anti-gun lawyer will come up with a good argument, sensible using
Kelo and other (Constitution-violating) preceding cases, and may possibly win.
Of course, I don't think that it'll be much fun to be the collection agent (especially if the folks in the village in question decide to turn in their ammo first-via airmail), but that's another matter. :>)