There are a lot of arguments one could make to support either supposition. EWR is a delay ridden and unpopular base for all airlines, and doesn't take advantage of all the operational efficiencies that the Q-400 offers. Retrenching the Q-400 fleet in IAD would allow UA/CO to serve more routes that justify and are more lucrative than those served out of EWR. In fact, I would be surprised to see the IAH base last more than a year or two. I think that the Q would be a much better airplane out of DEN to serve the Rockie Mountain communities. We shall see...Always interesting and amusing to try and predict and second guess our management and industry.