materia system was just your magic and stuff in ff7, we already have that, were just missing traits and ablitys for each class like right now its too universal Job specific.
if they add something like that it should be none item system should let it be made another way, cuz just going to the markets and buying one is blah and typical, should be like ff8 draw mako from points on the map then build the materia you want from a list your character makes from quest then have that materia forever then you can upgrade it later or level it up. that would be more RPG and something you can build off of.
--just my version.