Tim Berners-Lee is absolutely correct that we should have even better collaboration tools in Web. There are two problems I see, first is of course that nothing really can replace face to face, free flowing, meetings with other. The other, actually why we don't any more have so many collaboration meetings, is that corporations and governments try to limit the information - there is no trust (any more?) So, someone will try to control and to limit what, when, where and by whom the information can be shared and Web systems can and will be controlled.

Until we get the Web collaboration to the level where "user" meetings were (at least in IT) in 70's and early 80's - corporations, even competing and vendors, sent members monthly to two, three day, very informal meetings where everything was discussed freely, no hidden issues (well, not many but it was up to the members..) It is unbelievable what amount of problems and new ideas got solved that way.