That's brought back a memory that I'd forgotten from many years ago. When I was being taken to or from school we went past a hand-made sign "Laurie Gant, shoe repairs" on someone's garden gate. It stuck in my mind because I expected his surname to be Grant rather than Gant.
Gosh, he was a rugby player for Wakefield Trinity and Featherstone Rovers
I'd have thought that there will always be a need for piano tuners, since it's not a job that most of us would be competent to do ourselves. OK, there are far fewer pianos than there used to be, because some/many people and organisations (eg village halls) will have gone over to electronic keyboards which can act as other instruments as well as just pianos. But there will always be *some* pianos.
I believe that pianos are best tuned so there is a *very* small discrepancy between the tuning of the three strings for each note, to give "character" and "richness" to the note. It takes skill to judge the best tuning for the three strings, and to judge when the first "reference" string for a note is correct for the 2^(1/12) spacing between semitones. I imagine electronic tuning aids (similar to those for guitar strings) help a lot.