This all strikes me as quite reasonable. I don't think you could have left these figures out of the set, but I also don't think people who aren't interested in the modern stuff should find too much here to complain about. Plus, there's sure to be people playing other RPG genres who will be interested in the modern minis *because* they're modern, so it shouldn't be too hard for PF players who don't want their modern pieces to find people who do want them to trade with/sell to. As someone who can imagine running this campaign at some point, though, I would have liked to see as well some variants on the rifleman, for instance a mortar and a flamethrower version, and I also think it would have been great to get a pale sniper. I knew it was always too much to ask for a Tsar Tank, or even a smaller animated tank, and it's probably possible to find a war toy to cover the latter, if not the former. (Have you thought of approaching a papercraft outfit like Fat Dragon Games for a papercraft version of either or both of these?) Actually, I think one approach you might consider is releasing a paper minis edition of just the minis for Ch. 5 of RoW.
Though I still haven't given up hope of seeing a Corpse Orgy in this set!