My (usual cynical) thoughts on all this.
Kodachrome is now ancient history. It was also, before Kodak pulled the plug on it, an entirely different film from the K-25 and K-64 I recall from the 1970s. The glorious Technicolor-like hues of the past had been quite muted in the last avatar, or maybe "mutation". 120 Kodachrome was, for me anyway, a complete disaster. None of my publishers would use it, the plate makers all said it was too iffy to scan with the equipment of that era.
Kodak made its decision many years ago and out it went, along with many other films we now all fondly recall (I won't go into my quest to get them to bring back Panatomic-X).
Poster #4 has a Nikon D800 but wants to race back to Kodachrome. I have a D800 too, in fact I have two, they are such great image-making machines. However, unlike him, I won't be jogging off to buy K-whatever, not at the price they would surely ask for it. And send it back to Rochester for processing?? Not in ten lifetimes. Kodak did that with K-120 in the '80s and it bombed, massively. I was told by one of their reps in Australia that it went to Japan for processing. Two of my 'shoots' got lost and eventually turned up, many months later. By then my client had insisted I reshoot the assignment (an architectural one), which I did. With Fujichrome Velvia.
Let us not forget that eventually we all have to learn this - life in the real world isn't what we want it to be, but as it is.