It is true that many spares are no longer available however the situation is not nearly so bad. Many of the parts for the CF range are interchangeable with the C lenses, it's evolution after all. Furthermore many old parts are still in stock but what has come to an end are mainsprings and flash contacts. But there is always an alternative solution.
Originally Posted by TheFlyingCamera
Don't write off the lens if the optics are good and the structure of the lens is sound!