Thank you for your role in creating such an amazing community. Things definitely began to decline post '07 and I eventually retired my dA accounts back in '12... But you're right, the experience it offered was completely unique and will be a subject of my nostalgia for the rest of my life. I met so many great friends through common interests, and would never have continued my interest in writing without it. And I almost certainly wouldn't be working as a web developer today.
I am currently drafting what I think could be this generation's dA, improving upon some of its shortcomings and offering new collaboration tools.
If you have the time and think you could provide some insight, I would love to email you some questions about your experiences building that kind of community, because it is exactly the kind of community I wish to serve.