What next? It's a great question.
My Theory: You like what you like when you were 15-20. It makes a deep impression when everything was new to you. When you can afford it, later in life, you go back to what really turned you on. For me, it was my neighbor's 1979 911SC. I now have a 82 SC.
Look to the opinions of 30 year olds today, that might be the key to 10 years from now.
The next generation was exposed to some pretty crazy cars. DP935 conversion being one of the extremes
. I doubt that will happen, so the flip side is to go original, as the real value of the cars climb due to their age.
I think we will have a very odd situation here. The Porsche 911 is the only car, except maybe the Beetle, that was essentially unchanged for 20+ years (69-89 in particular) Throw in excellent rust prevention, fanatical maintenance, and you have the singular situation that a extremely large number of car are still running, and being modified for track use. There is no precident.
How fast will the value of a older 911 rise? Will a rush to convert back to original flood the market with too many originals to support a big price rise? I guess we could look to the Ford Mustang, where original is very desireable right now. Maybe that is the trend.
I have kept all of my old parts, including my CIS, with spares. The only thing I can't undo is the hole for the front sway bar. But even that is correctable. Maybe in 10 years, it will start to morph back to original. That would make it 40 years old!