Plastic is okay per se. If it's anywhere near as flimsy as the T2i, or if the shutter sounds as horribly bad, I may be switching to Nikon. I don't want a 7D, too much money since I don't need its features, but I won't "upgrade" to a flimsy plastic 60D. If they try to essentially "force" me into a 7D price point, then buh-bye Canon! I hope they're listening.
I love my 50D. It's almost a relief to figure I probably won't be hankering for something new. But I also won't be getting any new lenses if they're going in the plastic fantastic direction. I don't see investing in a technology that I can't grow.