I would argue the 986 market bottomed out 3-4 years ago, at least in my area. I agree that the market has been very wonky the last few years, but it really doesn't change the longterm outlook. The people buying cheap Porsches and then cheaping out on maintaining them properly will thin the supply and increase the value of the ones that survive. Good, properly maintained cars and/or special editions will continue to command a premium.
The 986 is interesting because about 70% of the Porsche's ever made are still on the road, but they made a lot of 986's (about 200,000). I think it will take longer for the 986 supply to decrease and more than 30% will end up in junkyards.
Porscha
Hybrid Mode
