Personally, I feel the 60D is a very big disappointment. But that's just me. After seeing the specs, my next upgrade will be the 50D.
There's not a single sample pic from the 60D available anywhere on the internet yet, so I would reserve my judgment till then. Can I ask you, in what way is 60D < 50D, other than the construction and fps? The 60D has shares 7D's sensor, which delivers better image quality, high ISO performance, etc than the 50D. It also records full HD video, has articulating higher resolution screen, etc. It may be too similar to 550D in many ways, but I'm sure the 60D will be better than 50D. Why would Canon replace the 50D with an inferior camera? It just won't make sense. The smaller size and plastic construction just mean that Canon is repositioning the xxD series into a different segment, especially since more and more first timers are looking to buy "midrange" cameras. I still think the 60D will be a great camera, especially for first timers.