I believe that in the book The Mythical Man-Month: Essays on Software Engineering ( http://en.wikipedia.org/wiki/The_Mythical_Man-Month http://en.wikipedia.org/

I believe that in the book The Mythical Man-Month: Essays on Software Engineering ( http://en.wikipedia.org/wiki/The_Mythical_Man-Month http://en.wikipedia.org/wiki/The_Mythical_Man-Month ), Fred Brooks suggests that you "build one to throw away". I don't recall him suggesting that you change programming language. If you are having performance problems or you code has become spaghetti and your team is most comfortable with the current language then you could start again in the same language. This has the advantage that you could use good sections of the current implementation with the least effort.