Yes, you linked me to that back some time ago; trouble, today, is that it becomes a compromise because of the rest of the older system. As you know, I had a couple of the film cameras too, and loved them, but I also made a test once in an attempt to prove something to myself about enlarging same-size bits of film from different formats. In my case, I did it blowing up a 24mm x 36mm section of a 'blad negative and comparing it with the same physical size of subject area using the full, native 24mm x 36mm film from the Nikon. The Nikon negative was better; they were the same film types, of course, both either FP3 or the later FP4.
That test supported something that the BJP's chief tester, Geoffrey Crawley once wrote there, saying that people who bought into 6x7 expecting to be transferring the same quality of the full 135 format across a much larger film were going to be disappointed, because small-format lenses are better just because they are small, and need cover a smaller area of film.
Apart from that, of course, to go for the old 'blad system today would be a bit crazy because the best cameras are already relative antiques. No, a new system around the smaller square would be obliged to incorporate the latest developments.... probably putting it beyond my willingness to spend, anyway.
:-(