I think it's the logic choice for the returning digital people. Demand increased, followed by price increase.
Light, polycarbonate and portable(small) system, in someways similar to digital cameras, on the top of excellent lenses. They can live without back interchangeability for different films as they do with sensor cameras.
Concept of using tripod is left for aliens, like what's adopted in digital, and misaligned RF could not be discovered specially with stopping down aperture with fast films. Most Mamiya 7II are sold without noticing most degrees of RF misalignment, I do not know about other potential defects of a polycarbonate body being handheld(Not On Tripod) most of its previous history!
BTW, could not trust the accuracy of a rangefinder built in a polycarbonate housing. Long time ago, tried a polycarbonate film SLR, after sometime it disintegrate, not as compact/rigid as when it was new.
Also, prices of Pentax 67II has been doubled or tripled since few years. Similar to 35mm cameras configuration, though much bigger, with inexpensive lenses most with excellent performance. Again, they can live without back interchangeability for different films as they do with sensor cameras.
On the other hand, did not see similar levels of price increase in Mamiya RB/RZ or Hasselblad! Far away from being similar to digital ergonomics. Extensive systems, and modular, better for people adopting film in more serious and permanent way.