I've been designing games on forums for almost 10 years now, and I need to warn you: no game was ever designed on a forum. Forums are great for brainstorming and getting some feedback, but the real design work happens when you're by yourself, late at night or in the shower or staring grimly at a half-written text file.
Accordingly, here's my caution.
Designers: don't get attached to what you or anyone has said in your forum. It's probably not what you're going to do, in the end. It's just talk.
Fans: don't get attached to what you or anyone - even the designer! - has said in a hack forum. It's probably not what the game's going to do in the end. It's just talk.
There's a cycle I've observed, over and over: first there's lots of forum activity, then it falls quiet, then there's lots of forum activity, then it falls quiet again. The quiet phase is when the designer's actually working, and the forum is a distraction to the designer's work.
Fans: if you post in a forum during a quiet phase, and the designer ignores you, it's probably because the designer's working. When a forum goes quiet, it probably doesn't mean that the designer needs something to kickstart her interest, it probably means that she's doing the real design work she needs to do.
And finally.
Everyone: the usual outcome of real design work is an abandoned game. Only rarely is the outcome of real design work a finished game.
The best thing you can do is relax, work hard, and let the process do its thing.
Good luck!