I don't think you can generalize about 356s. The pre A and A model coupe pricing still seems to be rising. I can't say that about the B and C coupes and cabs. Convertible D's and Speedsters haven't gotten any cheaper either
I think you can still look at the 356 Registry forums even if you are not a member. You definitely can't post. Its a policy I never agreed with but the people that make the decisions are of an older generation and have totally disregarded the fact (IMHO) that forums don't run this way and its a big turnoff for many. Its all about getting revenue to fund the magazine which really is good.