If you're writing an open letter, which I agree you should, I'd try to get ppl to sign it petition style. Could use a site like http://www.thepetitionsite.com/ or something: disclaimer, haven't used that site before so it may suck.
That's probably easier than getting people to actually write feedback and people could continue to post the link on play.net. Makes it more public too. I'd still send your letter to feedback as well.