This topic has been the subject of several previous threads. The fact is the latter half of the 1960s through 1970s were a period of bountiful sales to many for whom a Nikon or Leica was a kind of costume jewelry, worn but very seldom used. These mint gems still come to market. Even if film use increases decades must pass before there is a need for new cameras. I agree wth earlier remark, we don’t need new cameras, but we need new repairman.
Except for some minor scuffing on base my cameras, all completely mechanical (only automatic cameras are Nikkormat, Contax T3, and Minox C and LX), are almost like new despite, for some, up to 50-60 yrs use. Bought many of them new. Expensive at the time but not expensive when amortized over time. Their computer will go when I go, but easily replaced with new user.