Hoof once said they've done it in the past and it didn't work well, but I think it'd be worth giving it another shot, because the alternative so far doesn't work well either.
HCS already has a forum. They do read and listen.
The only problem with forum is that the loudest opinion wins. And similar to polls, the forum has many posts driven by selfish interests, with no regard for the good of the game as a whole.
I believe that HCS should either declare a week of gameplaying vacation, where at least all the employees responsible for game mechanics or content, but preferrably everybody else, would try to actively PLAY the game from the very first level, with absolutely no upgrades, in a moderate-sized guild, to get firsthand experience. Give them a lot of reserve stam so that they could proceed quickly.
But if this doesn't happen, if they themselves are not able or willing to really play the game (anonymously, and with all the game brings, including getting hammered in early GvG, getting constantly robbed in the jungle on the low levels, getting bullied and insulted, getting no quest drop for ages etc.), then I really think that some alternative in the form of a game council would be a good thing, to provide a sort of voicing board for their ideas.
I could name a dozen players who have shown in their participation on the forum that they are able to think about the good of the game, not necessarily the good of their guild or themselves - and it's those people, who have a real and deep experience, who should be involved, at least in the form of giving advice. HCS are quite good and resourceful when adding new stuff and new ideas to the game, the only problem really is that by not playing the game, they quite often do more harm than good.