As mentioned, just consolidate towards center. "Removing" them would serve ZERO purpose.
I actually use one as a scratchbox for widgets, very handy.
I actually have 3 blank screens and I can think of two reasons why I'd like to get rid of them.
1. It's annoying and I'm obsessive with having my devices customized to the hilt.
2. Long-pressing home icon brings the "card deck" of homescreens up, and it would be great to only see the four I'm using and make it easier to see the small images in card-deck view.