Kinda late on this but DVI will be very soon outdated. It's a clunky large port as opposed to DisplayPort. DisplayPort is the definite future, HDMI the stepping stone.
When your graphics card has 2 DVI ports and you have 2 DVI monitors, guess what im going to use?
VGA is now outdated to where its no longer on video cards
DVI has 2 outputs on 970 and before. 980 and above has 1 DVI port, 1 HDMI, and 3 Display ports.
Reason being that DVI is still used is because it has the same potential as HDMI just without audio. Cheaper monitors that dont have speakers tend to use DVI.
I don't see it being completely removed for at least another generation of cards, maybe.