I think "demise" is not really the right word. The "renaming" of the 25 is really what is happening. Like the 'Classic' became the 21, with some small changes, the 25 has become the Inkosi with small changes.
When considering this new model I must commend CRK in moving towards a more sensible grind. After all these are pocket knives first, and pocket jewelry second. The cutting performance of the original 25 grind was OK, but not great. The Inkosi grind looks like a better balance between slicer and pry-bar, and may offer some more longevity before it thickens up.
One thing is for certain, any time CRK changes anything, the natives get restless. That's proof to me of how much people love their designs.