Because Khaled isn't a video/audio software developer. While there are libraries to help you with such things, integrating video capabilities isn't exactly trivial. He's also one man, maintaining an IRC client. He already has enough to do maintaining an IRC client and a full scripting language, I don't think this is really high on the list.
I doubt, even when ident dies, people will want video on IRC. Use the right tool for the job-- if you want video chat, use Skype or one of the hundred "video chat" flash applications out there with extremely large communities.
This conversation is really like saying, "I like to read books but I wish there was some way to deal with that annoying 'reading' thing."
