The greater the separation between current production and legacy, the more rare the legacy gear becomes.
That's how it goes.
The legacy gear becomes a hobby for collectors, as opposed to a cheap ride for the masses.
I worry about the consumables more than the metal - freewheels (120 mm not 126, not cassettes), chains, chain rings, brake hoods & pads, cables, tires, tubes,... because I actively ride my bike and these things get worn down.