I think you have answered your own question in part, although many of the current hoarders would be those who bought them at relatively low mileage (like myself in 1993) - but also it is likely that in fact quite a few did die - in the late 1980s Landrovers were still being used quite commonly by miners and other commercial operators (all would have been diesel), and quite a few of these were run into the ground - or wrapped round trees etc. (this is probably the fate with most of the 6x6s) Also, quite a few were bought by farmers, and these are probably still mostly in use either with original owners or near neighbours.
V8s tended to be more commonly bought by city dwellers and not worked as hard, hence more long lived, and also, particularly with the high fuel prices recently, the same ones tend to come on the market fairly often.
John

