IF they add a (small, desktop-functional) iGPU to the "new IOD"... what if they introduce that as a new system chipset, X670, and have an actual "chipset iGPU" again? Or they could put it on the CPU die. But honestly, it wouldn't be a horrible thing, would it, for the system chipset to contain the iGPU again? Unless, that could cause interference (requiring a switch) between an actual APU's video output pins, and the chipset iGPU's output pins. That might complicate things somewhat.
Or maybe they should bifurcate the system chipsets, and make ones FOR APUs, that would pass-through the video outputs, and make ones FOR CPUs, with a (small) chipset iGPU, primarily designed for "business desktops", with Ryzen CPUs. Kind of like Intel's Q-series chipsets. Obscure, OEM-only, but designed specifically for business desktops. Maybe bundle those (with chipset iGPUs) with Ryzen PRO CPUs.
Edit: Not entirely unlike the 760G, 780G, and 970, 990X, and 990FX chipsets that AMD had for AM3/AM3+.