I'm no expert on the economics of the model car industry, but I think this could be a growing market for the model companies. A lot of us have commented on the fact that we have enough kits to last us a few lifetimes of building, or that we're out of room for more kits, but an attractive package of cool parts (we all know that tires and wheels can make a model) seems like a winner, especially for the adult market. I would also think that lower tooling costs (and in many cases the use of existing tooling) would factor into the equation.