Not only has the number of professional photographers shrunk, but as well the number of MF systems sold in the world, dramatically. There is also a serious study which put the figures of MF bodies sold in 2003 at some 20'000 units (worlwide), then 12'000 in 2004, 8'000 in 2005 and may be just over 5'000 in 2006.
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Wow, I had no idea the numbers were so low.
Back in the (film) days, a top-of-the-line film camera (1n/F5) sold in the low US$1000's, and a mf body went for approximately triple that. One could see a similar price delta (again, very roughly 3x) between mf and sf in cost of lenses, film processing costs, etc.
Now that digital has arrived, I believe MF will continue to shrink to a small set of core afficionados, until/unless a similar price premium of ~3x is restored. In the digital world, a very good small format body will set you back ~$3000, wheras (excepting this latest Mamiya announcement) medium format body + sensor is $20-30K (depending on sensor).
This is a 7-10x delta for the initial investment for mf vs sf digital.
Although it saddens me to see it, from this it is not surprising to me that so many photographers are migrating away from mf.
With so many fewer mf photographers in the fold, I doubt the numbers will return to 20,000 units sold per year any time in the near future. But once the mf/sf delta is restored to a more reasonable premium, I would expect the diminishing trend to (slowly) stop, and even reverse, particularly if the MF offerings are competitive in other areas as well (e.g. AF performance, metering, lens selection, portability, service, etc.)
Very interesting discussion, everyone.
Best regards,
Brad