It's going to be important in the way Lisp and Smalltalk are important. Many of the key ideas will find their way into other things which will be less pure, still powerful, and a lot more popular.
Is the fancy Wave stuff cool for hackers? Maybe. Is it good in a product? No. I'd go far as to say Wave is to Fridge as Linux is to OS X -- Wave might be important, but not in actually using it :)
EDIT: Jive are one example, not the link I had in mind though: