I think a lot of great ideas like the upgradeables didn't take off simply because there was no promotion, and no promotion because there was no money to do it. Train magazines are a start. But print media ain't cutting it for Lionel or the others. At the least it is not reaching a broad enough audience
Maybe many of you will disagree, but I don't think it was an accident that some of the best recent sellers are hooked to something the kids and parents SEE (movie, tv commercial) and the parents make the connection to a purchase. PE, Hogwarts, Thomas, etc. I agree with the funnel comments.
I've got to go back to developing my Christmas 2008 Budweiser commercial that has the Lionel trains with Nascar freight cars circling around the Christmas tree, replacing the Clydesdales routine. And perhaps a Clydesdale can be peering in the frosted family room window and shaking his head as if to say "YES, GO FOR IT!"
Jack
PS: You also better believe that the marketing folks at the train manufacturers are reading the many train forums and are chomping at the bit at threads such as this.