sorry to sound confused
but i don't understand how a photographer,
or someone using a camera these days has to become a jack of all trades ..
because he or she might have to work with a different film than they started with ?
the thing people need to do is embrace change and have an open mind.
always using the same film, subject matter and technique leads to stagnation.
it is always good to try something new, and broaden one's horizons.
AA didn't invent the zone system, he just refined a system that was invented many years before, for his own use.
i have a feeling if he couldn't use it anymore, he would figure out another way to control his tonal range and exposure ...
maybe he would take up painting or stay with music ?