There's your answer, right there. Don't overlook that statement. Be careful forcing a square peg into a round hole, out of fear or hype or whatever. It's about throwing that thing over your shoulder, and having it be an EASY NATURAL extension of how you see.
I agree.
You'll move your career a lot further by shooting more, experimenting, learning post production and investing in what is in front of the lens vs. what brand of camera is between the lens and you.
Be careful on public forums, especially this medium format section, because this is more about brand/format worship and camera sales than it is about actual photography.
If your hasselblad works, you like it, it suits your style then buy the least expensive used digital back you can find. 18mpx to 39mpx your clients won't see the difference and quite honestly if you learn post production well, you won't either, at least once the ink hits the paper, or you knock them down to 900px wide jpegs for web view (where 90% of our presentations come from).
The first downside to this is you'll have more moire (see the d3x-aptus comparison) and if you shoot in low light you'll spend more time either lighting and/or shooting from a tripod.
The second downside is once you start with digital you get hooked on the fear factor of bigger is better. It's not, at least to anyone viewing a photograph, but since a 30" monitor is how we now proof our images, it's hard not to get hooked.
Personally I think you'd be better off shooting film for yourself, some kind of used dslr for your clients which allows you more time behind the camera and less time fixating on the computer.
You only have so much time, so use it wisely.