I read all of ideas untill here, some of them are really good. Every single post in this topic is one step for best solution.
I was thinking about improving forum profiles. i.e: ppl who have 250+ posts or w/e can be able to create groups like "supporter hero lovers" or "I hate nevermore" etc. (think like facebook groups) Clans can have special groups and there can be "clan wars" section.
This improved profiles can provide small challange between ppl at here. Imagine; I go to Icy's profile and click on challange button and asking vs. with him. From this point; we can discuss about time via pm. Ppl must have some point for communicating with eachother. Forum can be alive with this imo. Nothing has to be fancy, just adding things some stuff in current profile pages.
Lets take a look from a new member's eye. I signed in and posted something in "New member introduction" and what? "meh, its borring I'm gonna play some pub games and not visit this forum anymore" Thats it. There is no LA introduction topic or something like that. I've watched a lot of replays and most of ppl don't even know how to report mh-ers. They are still asking to other ppl in games. There could be Wellcome topic/section in forum. LA introduction video could be cool. Our gfx crew can take care about it. I know we can reach all of the information clicking sections one by one but it can be quite borring for new member.