I would think that a reasonable well looked after 80 series would be worth similar to a 200 series in 10 years. Probably about the same as a 100 series. And being a Nissan driver I am not picking on toyotas, the same will happen with Nissans. The new Patrol coming out is supposed to have 4 wheel independant suspension and no sway bars to give it extended wheel travel but the vehicle stability is all controlled by electronics. Not sure how I would feel about that, driving into a sharp bend on a highway and finding the computer has had a hiccup...
I happen to have a VY one tonner that I am thinking of selling, doing some research on them I have found HZ one tonners for sale around the $7-$8,000 mark. They were less than that when new and some of the six cylinder VYs are the same sort of price.