This is coming from a business consultant (BA/PM and configuration primarily), but in my experience, it seems like the OOP paradigm is fine in most cases and is leveraged in a functional/compositional fashion typically, so I fail to see the issue with OOP a paradigm. Generics and polymorphism can be used to basically create a functional system that only uses domain specific classes to handle edge cases.

In short, OOP as currently used, in my experience working on numerous RIA/municipal/county government enterprise document management systems, seems perfectly adequate to the tasks at hand and can be used in an effectively functional way.