“A full keyboard organ”, with all the ‘stops’, requires an organized mind, a penchant for loving hard work (playing a footpedal gigue isn’t easy), and no headphone jack.
Look at today’s under 40 folks, wunderkinde not included, and see if they fit this pigeonhole.
Excellent point. Pipe organs are amazing engineering works. In Bach's day, they were the "Space Shuttle" of that era. The pinnacle of high tech.
Playing one well takes a whole lot of talent, and coordination. Your feet have to work in synch with your hands.
Young people can't even put a spare tire on their car, let alone change the oil. Many can't walk down the street without staring at an iPhone, oblivious to their surroundings!
And back in the day it wasn't uncommon at all for mom and dad, or grandpa and grandma to have a Hammond or Thomas in their living room. And the elevation of the the guitar to the instrument supreme has not helped.