How can we save the "Heroes" theme?

It's no secret that our forum is transforming from a "Heroes" forum into a general "off-topic" forum. While I don't mind off-topic discussions in general, I don't think it's the right direction. But it seems this process is inevitable. What's even more regrettable is that many "veterans" of the forum, specifically those who were active in the "Heroes" section, are becoming less active. This includes Celt, Sergh, Rean, Ann, and many others. These people have been on the forum for a long time, much longer than many others. Now, they only appear occasionally, and even that is rare. Something needs to be done about this.
What are your CONCRETE suggestions for preserving the "Heroes" theme? Please keep this thread free of off-topic discussions and arguments – any such behavior will be strictly moderated.