If your not printing large it does not make good economic sense to purchase MFD. Look at what the H3DII-39 ($35,000 new) are going for now used... $12,000 ... not more than two years old! I assume that anyone using MFD is forced to use them so that they can keep up with that invisible customer crying out for more... well your now outdone and need the H4D-60. This is getting absurd.
I understand what you're saying, but...
I still maintain that there is a place in the market for a "people-shooter MF back". These, to me, would be the Specs. No idea if it's buildable or marketable:
1. 22 MP, max. Anything larger than that, most of the data is thrown away.
2. Two frames per second, recycle.
3. Price point: $9000-12,000 USD, for the digital back.
4. Usable ASA up to 800.
5. Largish chip, similar in size to p45, to keep large viewfinder image, and to maximize wideangle lens use.
6. Hi-resolution LCD, similar to Nikon or 5D2.
Even though Canon/Nikon is fine, there are still many people that simply prefer the look and feel of medium format cameras. However, it seems that the Megapixel Race is on, and the Retail Prices are headed thru the roof, at a time when the economy couldn't be in a worse condition. There's nothing wrong with letting the P65+ (or whatever the Hassie equivalent) be your Lexus, but there's also a need for a Camry too.