You asked for input..... To keep a format and website alive into the future, look at what is fine for the older generations and look at what is appealing to the younger generations also. They inherit this hobby, us old dogs are old guard
I agree the format and archive ability and sectionalized areas on PY are king. Tidy and navigate well.
What does facebook have that appeals? For myself:
A lessor level of anonymous. Most people are who they say and visible. I believe it helps with forthright and posting issues a bit. It is nice seeing real people not handles.
Ability to have big pics in posts. And videos with play button, and preview screen.
Link and share ease of stuff.
Networking capability and business page stuff. People seeing my post can see I have a business page and click boom to that site, so it is a business exposure benefit.
The international and even in US crossing more social spectrums, of people that post. I see Firebird owners from all over world posting on FB bird site and that is way cool. I know we have international here, but it seems nowhere near the scope.
What I don't like is the transitory "for the moment" nature of FB. A big scrolling screen where yesterday fades quick. It is more a "social" aspect of hobby than real reference, expert stuff as here. Although I see some same people and some high level knowledge mixed in the huge rookie pool.
You can incorporate some from with worlds. Some web forums allow a posting with FB log in. Incorporate some feature that people like in FB. People are expecting this stuff more and more. Make an anti FB stand and that is ignoring that most people utilize it these days, for business and reference and information look up, in conjunction with Google. I thought FB was silly, was forced into it for business reasons, people asking / expecting it. Now that I am on it I see cool features, also negative aspects. Combine some of two formats (old school website and FB interactive style) and you have a winner, IMO.