I too doubt that Trek is actually building the bikes. But they are working hard to be a 100% complete supplier to each of its dealers. That is you could open a bike shop, a Trek account and not need to work with any other vendor. They have built their dealer catalog to include helmets, tubes, tools and any other miscellany you may need.
The two precautions for any shop wishing to go "All Trek, All the Time" is simple, Trek could one day implode like Schwinn did leaving the dealer holding an empty bag (unlikely). The second is Trek puts no effort into marketing these 'niche' bikes in their portfolio. No adds for folders, tandems, etc. So they not adding any value to their dealers with these auxillary lines.
My two cents...