I have seen a few, with many Windows servers. With number of dinosaurs as well, some in process of being decommissioned.
I mean the mission critical stuff that Fortune 500 companies depend on to run their busines... ...That does not include miscellaneous x86 print servers stuck in broom closets and unoccupied cubicals.
Keep making fun, but in the meantime, keep an eye on an one important parameter:
How big is the market of hardware and software that x86 based servers are not able to handle?
The difference between this number (5%?) and the number of some 50% you have been waving around is fat. Market forces have a tendency to perform a liposuction on this fat.
Market Data 
Markets 
AI
