I can see model kits being sold online in a downloadable file, and printed at home.
That's exactly where I see this going. There will be a whole new crop of model kit "manufacturers" that will sell you a kit in printable form... all you do is buy the "kit" and print it out. No more injection molding machines, no more tooling, no more factories, no more packaging and distribution.
The music industry is almost there. It went from a physical product (first records, then tapes, then CDs) that had to be manufactured and packaged and shipped and warehoused and sold in brick and mortar stores, to where we are now... downloadable electronic files. Every year, CD sales are falling and music downloads are growing. Soon CDs will be relics of the past. I've read that auto manufacturers are already phasing out in-dash CD players.
The newspaper industry is going the same way. Every day, a newspaper goes out of business. Why bother with giant printing plants and huge rolls of paper and hundreds of trucks delivering the paper to hundreds of locations when you can do it all online a lot easier and a lot faster, and save a ton of money, too? It's a no-brainer.
I see the model car business going exactly the same way. Why bother with machines and factories and packaging and shipping and inventory when you can do it all electronically and eliminate all of that stuff?
It's inevitable. The only question is how soon will it happen.