mearls said:It's interesting to watch people take something they don't like, invent an entire system of beliefs and goals around that thing, ascibe those beliefs and goals to a fictional group, and then pour hatred at that group.
Actually, I think most of the critics here are simply taking you at your word. Here and in your article. I'll paraphrase: "Rust monsters are great for experienced DMs, but we want to make the game fun for novices." So instead of providing guidance for DMs on how to run an effective rust monster enounter (say, a sidebar), we instead make the encounter less special so as to significantly reduce the consequences of it. This sounds a lot like Sean Reynolds going on about how drow magic weapons disentigrating in sunlight was "bad game design": "the players should never be parted with something they've won for arbitrary reasons" (again, paraphrasing).
I'm always surprised at how people's first reaction is never to lift or educate, but to dumb down or blunt. As someone else mentioned earlier in the thread, most groups who don't enjoy encounters with rust monsters encounter mysteriously few for an uncommon creature. And that's how it should be. You seem to be fixing something that isn't really broken.
Now as a hypothetical example, this article is a great demonstration of how R&D will monkey with something sent up from design! It would probably have been less incendiary if you had used a completely new example, or perhaps a flumph.

Tom