How about we standardise the voltage requirements and physical connectors for all wall-wart-y gear?
Then you can sell me a 1U (universal AC voltage!) power unit with 20 little power sockets on the back and one big mains cable.
I'm happy because I don't have to find space for another wart behind my racks of gear and you're happy because you don't even have to provide a power supply with your gear.
We're close to this with guitar effects pedals, so why not other gear?
An Eagle for an Emperor, A Kestrel for a Knave.