How so? For example, are you saying that a bank teller, teacher, or stock broker are buying the Phase One 645 DF with digital back?
Why do you think there is those PODUS seminars?
Even the costs of cameras has hit the high end dslr makers. One camera dealer I buy from told me in the first 4 months they received the d3x he sold 24 or 25 of them and not one to a professional photographer.
It's not that medium format is not "good" or not usable in a professional world, it's just become more marginalized due to client expectations towards volume, adding motion imagery to most projects and the fact that nearly every still photograph gets so heavily manipulated in post processing.
Even before the economy and the advertising media changed, I shot a lot of side by side Canons, Nikons, Phase etc. and almost every time the client picked a dslr file and not because it was better or worse, just because due to the speed and ease there were always more options and though I shoot people I know still life and architectural photographers that have the same experience. (Mostly due to Canon's new tilt shifts)
The cameras didn't change, client expectations and needs did.
Now what is funny lately we've used our medium format backs more than the previous year, mostly because we are doing so much work in post with outlining, and adding changing, swapping out elements and when we have enough light, (and enough time on set) we'll shoot it with a back rather than the Canon cause it makes the retouchers job a little easier, unless you get pattern moire.
BC