As long as Channel 4 is the #1 News in DC, there's no need for them to change. Channel 9 did it because they were/are last in the ratings, Channel 7 is doing it to try and catch up to Channel 4.
“An engineer explained to us that hundreds of ear impressions were gathered in the name of research, and while each one obviously boasted its own unique shape and size, one single characteristic remained uniform across the board: the entrance into the ear canal is not a perfect circle, it's an oval.”
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Newschannel 8 will be going HD sometime as well, but it's not known which, if any, cable companies will carry it.
As for broadcast HD news, WTTG is probably next, and WRC, owned by cheapskates NBC Universal, is probably a long, long way off.
As long as Channel 4 is the #1 News in DC, there's no need for them to change. Channel 9 did it because they were/are last in the ratings, Channel 7 is doing it to try and catch up to Channel 4.