While that is technically true about the GLC replacing the GLK in the lineup, there is almost nothing similar between the two. The body structure is different, the interior materials are different, the powertrains are different, the steering and suspension systems are different, even the frame was changed to add additional strength and also to allow for the additional length of the GLC vs the GLK. Mercedes engineered and produced the 2.1 liter 4 cylinder of the GLK, as well as the V6. For the GLC, there is no V6, and Mercedes teamed up with Renault to produce the new, lighter, and more powerful (by more than 20%) 2.0 liter 4 cylinder.
I do see what you are saying though, but the GLK that was is, for all intents and purposes, a complete thing of the past, as the GLC is such a completely different animal, which is why I referred to the GLK as being killed off.