To implement your message-passing architecture, we can add a 64-bit offset value header field to IPv6 bus packet, then we can access all the memory/IO space of devices all over the world!!

Electronics of 2020 will be very simple. Soldering is no more required, all you have to do is to connect CPU/GPU/DSP/Memory modules to optical network switch with optical fiber cables.
If you are not satisfied with performance of the system, just connect another Epiphany-VII modules, or call your friend, ask him to share his spare Epiphany modules through internet.
It's fun to imagine the future...