Will browser based chat take over?

I was wondering if we would see the disappearance of chat clients that are not browser based. This idea came to mind when i saw that facebook was releasing a chat platform (video here):
Facebook is now the most used social network and growing steadily. Facebook has one big advantage over some platforms:
There is nothing to install
accessible from everywhere
All your friends are already on.

You may point me to a service like meebo , but in reality many people do not know about this service. In my group of friends on facebook (over 100), not one or maybe one other than me knows about this type of service.

This is going to be a big influence on many chat users, but programs such as adium, trillian, msn and aim will probably still be used because:
The possibility to integrate ones facebook account into a multi chat client will arise.
A program based client has more flexibility and customization
Chat programs have games, emotions, winks, nudging, growl notifications (mac exclusive).
Many people from other countries do not have a facebook.

I am guessing that facebook chat will be used by many users and it will eventually evolve into a equal to a desktop chat program. Some users will still prefer using chat programs as they offer multi networks and facebook may be on there!

The comic of the post, cant forget it! Special tech style comic: