I agree. I like the 'idea' of the metal body...but my hands are on the rubber grip, so metal or plastic doesn't really matter to me. I would actually like the slight weight savings, as I'm usually using a big heavy lens and maybe a grip and maybe a flash and maybe a flash bracket etc.
Oh, I do believe it's more about perception than function. But as humans we base a lot of our preferences on perception. When I'm shooting in studio, I like the heft of my 1D. I prefer it actually. With weight comes stability, at least for me.
At weddings, it would be nice to have a couple of Rebels around my neck vs. the 1D and 5D.

But then I am attached to the "feel" of these two bodies... which is probably why Canon hasn't changed their basic "feel" for many years. People like it, want it, expect it, prefer it.
Again, for a first time camera buyer this is a non-issue. But given the 60D's position in the market place and the fact a good number of 50D owners would have been looking to upgrade... I suspect most of those 50D owners waiting for the 60D will now make the jump to the 7D. That's just a guess of course, but I'm pretty certain I'm right.
I think that the size & ergonomics is a much, much, much bigger factor than what the body is made of. And besides, it doesn't take much 'polymer resin' to equal the strength of thin metal.
To a new buyer, I agree. To an existing owner of a 50D... eh, I'm not so sure. Time will tell.
As for the strength of plastics, I have no doubt a properly made plastic housing is just as durable for daily use as an alloy one. Again, it boils down to perception for many buyers. I've read more than a few comments from people giving purchasing advice to new camera buyers and most of them say "get the D300 if you can afford it because the D90 is plastic". It's almost always viewed as a detractor and rarely viewed as a bonus, except by the more experienced shooters who do prefer the weight savings.
Wasn't the original MSRP of the 50D more like $1300?
It was
$1,399.
I love that the 60D has E-TTL master, like the 7D...but the lack of a sync port really sucks.
I totally agree on both points.