I'm not saying that it will break if it's plastic, but rather wouldn't you expect a $2000 camera body to have better build quality; especially if it is going to cater to upper end enthusiasts and possibly professionals? I think it's pretty risky to be taking a plastic camera to shoots where you might encounter rain, high humidity, and extreme temperature changes (such as shooting outdoors in the cold and then going inside into a warm climate controlled environment where condensation will rapidly build on the camera). A plastic body will probably not have the same weather sealing as a metal body. When I first started shooting DSLR, I had my Rebel XT glitch out when condensation built on the body. But I vacuum sealed it with a few desiccant packs for a couple days and that luckily saved it.
Pretty sure we've been down this road before, but I'm too lazy to dig through old threads to find it...
My car has a bunch of plastic in it, and I'm pretty sure it does okay in rain, high humidity and extreme temperature changes. Matter of fact, the space shuttles used plastic in all kinds of different applications (http://www.glenair.com/html/plastics.htm), so long story short, no plastic doesn't bother me in the least.
I think you missed a bunch of previous posts including the ones about the weather sealing of plastic "camera" bodies, but point taken anyway lmao