I don't think the minority of bloggers who post here to complain have a great deal of influence or in fact much at all one the changes that have already been made. I believe by the time we experience the changes we are in the unenviable position of providing feedback that Staff interpret as our feedback as support for improving changes that we didn't want in first place.
I could be wrong but I believe the developers ears could be tuned into the people who are using free WordPress.ORG software to make an income from and are primarily catering to their needs. I say that as I know that about 90% of those who attend recent Wordcamps are making an income from free WordPress.org software and that Matt has stated he is aimed at creating "parity" between those WordPress.org software users and WordPress.com bloggers with regard to features and functions. Indeed that's why the JetPack plugin was created for them.
I've been here nearly 7 years and I don't know of any formal or even informal way that any free hosted WordPress.com bloggers, who are not also on Staff, are included in the decision making process and feedback loop re: changes or the preliminary testing of changes as they are being fleshed out. By the time we experience these core changes at WordPress.com it's only about a month prior to the release of the upgrades to WordPress.org bloggers. Hence, even if and when many WordPress.com bloggers complain here in the support forums they constitute a minority of WordPress users, so Staff can observe that millions of others are not complaining.
If you have specific issues with the Media handling changes there's a sticky post at the head of the forum you can consult http://en.forums.wordpress.com/topic/changes-to-media-handling?replies=1 If you still have outstanding issues with Media handling after that you can post threads and we Volunteers will assist you or if we can't help then we will tag threads so Staff assist you.