I think it sounds an interesting idea having a fixed lens smallish MF camera similar to the Fuji X100 or Leica Q series. Depending on price, final specs, size, ergonomics etc I could be interested. Even more so if fuji make wide and tele converter options as they do with the X100 series
Although a fixed 35mm lens that would provide a 35mm (28 equiv) at 100mp, 70mm (55 equiv) at roughly 50mp and 140mm (110 equiv) 25mp images - or at least something like that, which gives plenty of printing options even at the 25mp size.
Given that the 35-70 is my most used lens on my GFX50s ii that does sound interesting...