Ok, if this article is correct then it's a big problem for Google. Because their entire revenue model is based on earning money from from advertising... I can't imagine enterprise level organisations allowing Google to Earn money via advertising.

I know that Google have made some efforts to make money by directly charging Enterprises but that represents a tiny part of their revenue to date.

In other words, is Wave a much smaller opportunity than they had hoped? And if so, it might just end up being a "side project"...