Has it really joined those ranks? Maybe in Jeff Atwood's bubble Ruby isn't the new hotness anymore but I'm still seeing everyone and their dog gush about how awesome they are for ditching their old and busted language for Ruby. To be clear, I'm not saying Atwood uniquely lives in a bubble, we all do, and I don't mean it in a bad way. Just that maybe the people he's talking to feel that way but it's been my observation that the larger developer community is still all about Ruby for coolness' sake.
Well, everyone is somewhere on the embrace-new-languages spectrum. It's clear that the people on the far edge of that spectrum have long moved on from Ruby. But there are still plenty of people further back. I'm sure we have years to come of stories of people switching to Ruby, just as we still see them with Python sometimes.