I've found that the biggest problem with DisplayPort is that even if it is technically superior (unfortunately I'm not qualified to know whether it is or not), active DisplayPort/HDMI/DVI adapters are incredibly expensive.
Since HDMI and DVI came first, this limits the use of DisplayPort; manufacturers are unwilling to create a device that requires a $100 adapter to work with what most people own.
Since HDMI and DVI came first, this limits the use of DisplayPort; manufacturers are unwilling to create a device that requires a $100 adapter to work with what most people own.