I'd much rather have a large application written in OO w/ Java then a functional only application. I have serious concerns about maintainability otherwise.

I'd much rather have a large application written in OO w/ Java then a functional only application. I have serious concerns about maintainability otherwise. This is of course assuming that we have good developers on either side. Especially when the language in question is getting libraries and native features that pull in the good parts of other languages. Blog posts like these make stupid generalizations. I'd also like to say if 5% of the Java Developers are the good developers that would be factors more than 100% of the Clojure developers + 100% of the Haskell developers + 100% more than the F# developers.