Not to mention that I expect a good number of Land Rover LR4 owners to switch to a Land Cruiser when their LR4's finally wear out. Unless Land Rover comes out with a new Defender in the LC price range, those buyers are going to find the LC the closest thing to what they liked about their LR3/4.
As for buying a new LC and taking it "off road", some of us have/are doing it. But that segment is tiny compared to the overall market. Toyota does have a couple things working for them, though. First, they have the LX570 for those who prefer a bit more luxury while compromising a bit on aftermarket, off road "enhancements". Second, they have kept the LC "modifiable". They may not offer a stock off road version but they are also reasonably easy to modify - probably the easiest in its class (though it does tend to be in its own class). With the Land Rover LR4s the stock tires were 255/55 R19s and it was very difficult to get much larger. Lifting was much more difficult and you still had issues with tires. Also less after market options. And the latest LR4 exterior styling queues were much more about "I want to look pretty" than "I want to look hardy, robust, capable, reliable." So for off road and over landing segment, I don't think a strong, reliable, highway-comfortable, LC customized with owner-selected enhancements is a bad thing. If Toyota started trying to do it themselves, some of us may not like the choices the make and it may be harder to modify those choices. So buying new or used then customizing to personal needs/tastes seems like a great way to go for me.