Your laughter echos with this bubble, please stop.
As far as home printing, the fad will, fade.
Marketing will see to that.
Like streaming, getting all the companies on board with one thing is like herding cats.
Most people just buy from shops or mail order.
Take GW, most people aren't looking for a non GW marine, or even a specific shoulder pad they don't sell.
Home 3d printing isn't a rattly box with a warhammer sticker on it.
Even if companies did jump on board, they would end up going proprietary and you'd need their printer and plastic. Like what happened to steaming.
It's likely anout as cheap for GW to ship spools of plastic as it is sprues.
I'd say doubly so with the old world using existing moulds. Which is its own point, as its success (and followers like VOID, and no doubt many to follow, X starship troopers!) proves people prefer "traditional" figures over 3d prints.
I'm sure there are people printing not TOW armies, but most are buying them or using "old" figures.
Anyway, plenty of points left unsaid.