The Inventory World will go ballistic. "I've got thousands of units of 14 different motherboards in this warehouse section, and there are 10 CPUs that fit each. So, now I'd need to reallocate space by the factorial effect of mating every motherboard with every CPU possibility?!!" Yeah. Riiiight.
If one looks at the HiFi Industry, the home-built hi-fi scenario lasted from the '50s into the late '60s or early '70s? Then, instead of building the hi-fi's mainboard and tubes, audiophiles were left with separate components for "component systems". There is some of that bleeding into the TV world today, but there aren't very many "hi fi/stereo" shops on any street in any town now.
I'm sure this will be the way of the computer, too. The pre-built computers have always outsold the Parts-Assembled Computers, but something tells me the future will be far more dim for these enthusiast-builds.
As long as my NAS units can house those bakers' dozens of 14Tb drives, I'll be happy enough.