Well, if they're coming up with an overall color of the universe based on an average, then of course it will come out beige!That's what beige is: all the colors mixed together, with a lot of white added. Anyone who's played around with the colors in their paint box knows that!
I think we should get these scientists out of their laboratories, and into a kindergarten classroom, then give them an easel, and a lot of fingerpaint (heck, they're aleady dressed in those long smock coats).
And then remind them that in the real universe, there are no averages. An average is a useful mathematical tool for wrapping your mind around really big and/or complex numbers. But when it all comes down to it, I don't really think the Universe cares if humans can comprehend it all.