Great article. Quick comment on the ubiquitous greying of the hobby trope I think you hit the nail on the head with the introduction of rules that allow easy transition to historical miniatures.
From my observations at recent HMGS conventions I have seen lots of new and younger faces mingled in with the greying ones. I think Bolt Action is a good example here bringing folks over from 40k. I see new Zombie rules and Pirate rules, Blood & Plunder bringing in new faces, at least ones with some shekels to spend!