...

Not to be obvious, but given how in FFXI when a new job came out, they had absolutely no problems allowing said new jobs access to said older material, i.e COR was added perfectly fine to previously RNG only Guns. (For the most part.)

Job system is optional, but there's no reason materia would be locked to only existing classes when they're released -- It's a general system which means jobs will have access to it, if anything Materia was made with the new jobs in mind. So I'm pretty sure this is the last thing to worry about. Also as said, purge it.