We're not starting off from scratch, though, as we would if we were getting a team in, say, SA, NT, Tas. We had the Reds in the mid-late 90s, which when they folded, a large number of kids then went across to union. Then Force came in, so there's been a pathways system in place for union since, what, 10-15yrs ago? It's not League, but at least there's a lot of transferable skills and body shapes in the union kids. A large portion of the kids playing union or League (or both) are just looking for an opportunity, regardless which of the two codes they can get it from and will flip and flop between them (again, noticeably when Reds came in then out, then Force in and out, WC Pirates in and out while Force came back in). Perth NRL team will swing a number of kids back our direction.
So yes, kids over here are indeed force fed aussie rules, but at the same time, there's a decent amount who, like me growing up in WA, aren't interested in it. Especially from a 'playing it' point of view.