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It's not too bad for practical use, Vita Nuova uses it commercially while the site is not much to look at, the guy behind it is still active. Inferno is also nice for making lightweight, networked systems and as such leans itself nicely towards use with a pi.

http://doc.cat-v.org/inferno/

I know of commercial products containing Inferno. What makes you think it impossible?
Well, code reuse is a pain, for starters. Limbo is not something people actively develop in, there are very few native ports of networking protocols, and you need to rebuild the OS if you want to expose hardware functionality.
Only takes about 30 seconds to recompile the OS, though.