It should really just be closed down. It serves no function and has never served a function. People who actually have things that they personally are writing either do it in private or do it in Event Submissions, and there aren't nearly enough people who write submissions to clog that forum.
The only thing that the Ideas subforum does is give people a void to yell into, and then have other people complain that they're using Ideas wrong and redirect them to What Content Would You Like Added?, which is another void for them to yell the same idea into again. And then nobody picks up the idea and it disappears because nobody has ever, or will ever, write someone else's idea if that person isn't willing to pay them money to do it. But there does still need to be a void because it's impossible to convince people that the above statement is true. So either Ideas should be the intended void, or it just shouldn't exist.