From the OPs original question - Yes the cars will become increasingly hard to sell- I got my first supe 8 years ago ish and the current prices are not that far off what I paid then.
The cars are older and have the potential for large bills simply to keep roadworthy,a £1000 bill could easy happen just with worn out suspension.
They are a dream car for many , but dreams and reality can clash,used car sales are all partof selling dreams ,,,
A quick look at the parts wanted/ for sale section shows how many people are trying to run these cars on a budget,does no one simply go to Toyota and buy what they need?
The short ownership and turnover in the cars is a sign of the "dream car" status and the use of second hand parts the reality bit.
The economy is in meltdown and the premium prices paid over the last few years during boom/ feelgood times is about to go into reverse.
However there will be the diehard owners that have the money and the skills to keep the dream going,the project cars and the cherished examples- these are the cars to get , but they are far and few between and outnumbered by too many poorly maintained, rough cars , just waiting to shatter someones dream