[svandamme]

Also early 911's an 356'es are getting stolen quite frequently.
They are easily re-vinned and very valuable.

So some people are genuinely worried bout getting them out in the open near their house because well it attracts attention and they might get stolen at home

and they are even getting stolen at concourse shows and what not..

I imagine that for a lot of other very old cars the same problem happens, that it's not a Porsche only problem.

I think for modern cars it will take a lot longer because well more of them were made.
The bigger issue for them will be environmental restrictions being applied, Low Emission zones in big cities are now already a problem for a lot of 80'ies and even 90'ies cars around here in Europe.