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Well, why not put them down on paper?
A few days ago I created a forum: http://makemymmo.forumotion.com/
I've always had some ideas that I'd like to see in mmos, but while I do have the ability to learn how to create 3D graphics and program, I'm pretty newb at it (the logo was made by me in Blender though ).
In this forum, you can post your favorite MMO ideas and allow people to see and discuss them in as constructive a setting as possible. I know this will be hard, but try to remove biases from criticism....don't be afraid to poke at the moderators for biases as well.
So if you and your friends have been discussing mmorpg ideas, feel free to (if you don't care that this is a public site that anyone can have access to) post on the forum.
The more people that post.... the more it'll be seen and the more future developers might care what we, the community, thinks.
Keep in mind.... the less negative you are, the higher the possibility is that someone will read and take into account what you say.