I am at a dilemma. Ok I have some really good materia.

Here's my problem, is that some materia, like this Fire Materia IV can be equipped to either Conjurer or Thaumaturge two-handed staves.

Say I attach the materia to Jade Crook, then the new job system comes out and Thaumaturge is black mage. Guess what, now I can't use that Jade Crook cause it's Conjurer only, and it's white-mage. I just lost the Jade Crook with the Fire Materia IV.