Hmm... maybe that's the reason the 60D didn't inherit the mag-alloy body from the 50D. It would go way out of the price range for the xxD line if the 60D had a mag-alloy body. Is the 50D considered a "pro" camera? If so, then the 60D is the first "pro" camera to have an articulated screen.
No, the 60D is not a "pro" level camera. Even Canon's own 60D page
calls it an "enthusiast" camera. Canon's pro-line is reserved for the single digit model numbers (1D, 5D, etc.). Some people even argue that the 7D is not a "pro" camera as it has a built-in flash, and lacks some desirable features that are only available in the 1D and 5D models. The official spec page
only markets the 7D as a "semi-pro" camera.
The 60D was the first step of Canon moving their "semi-pro" line of 40D, 50D, etc. into the "enthusiast" realm. From that standpoint, some see the 60D as a "downgrade" from the previous models in the same line. No mag-alloy body and reduced fps over 40D and 50D being key elements of that analysis.
The higher number single-digit models (7D, upcoming 6D?, etc.) are considered to be the new "semi-pro" line of Canon cameras - and that they will be carrying that mentality forward with their upcoming releases.