>1: Those products are build to run on Googles infrastructure, which you can't have if you're not Google.
Not necessarily. At least with Google Wave [1], Google ensured that they made the necessary modifications to allow users to run Wave servers by themselves. There is at least one provider running wave-in-a-box [2], and there isn't any reason that this provider should be the only one.
>2: Those products don't have customers, they have users. That makes spinning a profitable business off much harder.
Harder yes, but it's still well short of impossible. I was thinking that the Wave Federation Protocol could perhaps be monetized as a shared-editing/collaboration service. It could be positioned as a combination of Sharepoint and chat.
[1] http://googlewavedev.blogspot.com/2010/09/wave-open-source-n...
[2] http://waveinabox.net/