I am one of those (MF) users, and always looking for an excuse to upgrade my H25 P1 that I can only tether with. But table top work has diminished, and I can not see myself ever going with a new MF.
I would be in the market for a used 40mp or maybe Multishot. I also use manual lenses and never seen the need for auto lenses for tabletop. It makes little sense to me and adds complications that are unnecessary. I do have to do plenty stacking in my work so the P2 is perfect for that.
If a mini system doesn't allow for the rear standard to move for focus than I see no point. That is why the RZ and Fuji or HAss have no place in most table top studios that need such flexibility. With smaller FF sensors maybe the DOF has lots of help and with price it is why I was seriously considering the A7R2 with a mount to the back of a Sinar. But time and time again the one I have does perfectly fine. I've made images that are on 100+feet billboards. Yes, its a slow process compared to current things, but I don't think its very wise to be spending over $5k for anything in a limited application system, when that type of use itself gets such limited use.
Unless you need to do such purchases for the art director?..but then are you getting hired for the work you can produce or pretend to play the part? Perhaps its both? Maybe thats the prob, I'm not doing the marketing I need? There was a Phase One event in downtown a few weeks ago, the entire event was to show new photographers in the market how you need to use MF to separate yourself from others. This for 90% of photography is really meaningless, but if the people hiring photographers are uneducated, what can one do?
But these days, which art director is looking for the premo gear, vs the lowest bid? Maybe I need to change my surrounding?! Pre 2008 my table top work is in hundreds of top magazines over years, now I'm starting to look more for local style work in portraits and events as brands sending product has died for the most part/in-house... :-/ WTF?! Marketing consultants tell me I should be teaching and doing online blogs and online subscription videos. Others tell me you have to go for the local event and portrait market as they are always looking in the immediate surrounding.
I have always worked independent, maybe I need to shop for a rep or work for an agency?
Maybe my situation is isolated? But the demand for quality imagery has also gone down with the lower frequency of brands paying for magazine ads. Maybe I should go back to school to learn something else. I have a creative mind with good mechanics, but not a brain with patients for learning php sql and the like?! LOL....Well...sorry for the rant, but it ties directly at what your original post is, and I am an example of the direction you are talking about.
Maybe with a change in career one can afford a new MF system :-)