I was just discussing this with someone at Digi, and wondered whether they would release the hardware design files so others can make boards.
I was also envisioning some simple development boards with power supply circuitry and headers (sockets for the core modules and exposed pins corresponding to those sockets) that you could integrate with an existing ecosystem of development hardware.
It would certainly be a niche product without many sales, unless it was designed in a way that someone could design it into a product (e.g., form factor that fits an existing enclosure, or headers to interface with Arduino/RPi "hats").