Combining FP and OOP is not a practical goal in and of itself, either (although it is a research goal for other languages led by researchers, such as Scala). At best, it's a means to some end, and Brian Goetz treats it as such. He cares more about the why than the how.
Some problems get better solved as a set of classes, others as functions operating across data alongside pattern matching, and yet others are happy to take lambdas as callbacks.
Many of the anti-OOP crowd doesn't realize how much OOP is already available on Common Lisp, that Smalltalk-80 already allowed for a good LINQ like mix with its blocks and collection methods, or how SML modules can be combined to make what isn't much different from interface based polymorphism.
It is a matter of having a nice toolbox instead of just a hammer. :)
