I regard the D5 has an expensive Explorer, but more optimistically, perhaps the D5 evolution was just to provide a break so that when the new Defender is introduced and it looks almost like a 3/4, that LR will have something to save both their image and the company.
Right now, the only body on frame offerings out there are the 4Runner variants and the G Wagon.
LR could also market an Autobiography version of the Defender and hence cover from the Euro police market right up to the armored Limousine market per the jpg below.
In Italy, the Cabrini used to drive the Defender; now they purchase a 4 door Nissan pickup made by Renault; pretty much the same in the UK as well now.
Most of the Police cars in North America are Explorers but at least here, the four door F-150 appears to be the "car" of choice for our highway police with the Explorers restricted to the cities.
In summary, Land Rover could maintain a presence in the world market if they just reintroduced the 4 as the New Defender.