|laziness, impatience, and hubris
I disagree... I think that many of the "reddish" tones in the random photos are dark enough too fit in well with the blue scheme. For some reason (by design, I assume) the blue theme came up when I checked out the site last night and I was blown away by how much better it looked.
I think it would be a good idea to keep the red theme for those who want to opt for it (I myself might select it from time to time, for old times' sak), but as the poll seems to indicate, adopting the bluish theme as the default is a good idea that will make the site easier to read and more popular in the long run. It just looks better.