DisplayPort has been foretold to replace DVI in 2011 already, by analysts at In-Stat. They say that the number of DVI-equipped devices will have declined from 112 million compatible devices in 2007, to 3 million in 2011. The hardware manufacturers’ growing interest for DisplayPort comes from DPCP (DisplayPort Content Protection), a standard developed by AMD based on 128-bit AES encryption, which is suppose to protect the signal from being decrypted by non-DPCP certified devices. The fact that DisplayPort is free of royalty and license fees is an important part of it too.
The main threat to DisplayPort is HDMI, which is basically identical specifications, formfactor and features-wise. The biggest difference is that DisplayPort has been specifically designed for connecting a computer to a PC monitor, while HDMI is intended for connecting media devices, such as set top boxes and DVD players to HD-compatible TVs.