I have to agree - I predict that in 3 years, metro will look very dated and design will be focusing on actual information density and nice effects again. It's just sad we have to sit through this wave of crap before that happens.
I don't know, I think a lot of the design trends right now are being driven by touch interfaces. When the mode of interaction is the ridiculously inaccurate finger, you HAVE to have giant swathes of empty space, otherwise nobody is able to actually hit what they want.