One camera, one lens (not cheap).

Fuji has much more than doubled their sales in the medium format market since the 50r was released. And they will announce the 100 on Thursday and it is expected to ship by end of June. They also now dominate the MF market. And the GFX 50r hit #1 in sales on Amazon and B&H a few times--amazing considering it is MF.

So the statements about the camera being on the way out are not well informed. :). The price drop is about the pending new release.

As for a One camera, One lens option: I vote for the GFX with the 32-64 zoom. You can do any sort of portrait including headshots. Having a longer lens is nice, but you can do fine with just the 32-64.

Unless you are an established professional with a well-defined market, it is short-sighted to purchase equipment based on limited anticipated use. Portaiture implies a formal setting, complete with studio quality lighting, backdrops, and such. In common usage, portraits often informal snapshots of family and friends, or on the street. That's okay, but dramatically alters the kind of equipment used, favoring smaller with a larger lens selection.

Landscapes, too, have many variations. We think of Ansel Adams with an 8x10 Deardorf, on top of his truck, or Galen Rowel hanging from a climbing rope with a camera in his free hand. I used a Hasselblad for landscapes and travel for nearly 10 years, and a Nikon D3 for everything else. Then the Sony A7Rii appeared which changed everything - medium format quality in a Leica-sized package, and all in one kit.

I recall an occasion when I was called to shoot a grip-and-grab presentation, and all I had was the Hasselblad. Hand-holding a Hasselblad under poor light is one way to get box camera quality from an otherwise great camera.

There's a rule in carpentry, "Measure twice, cut once." That applies to expensive purchases too.