I don't think just lowering the amount of materials helps much. The issue still is that you both try to force people to do content they really don't want to, and the new augments being really only obtainable for people who don't need them in the first place.
I don't think it's healthy for pvp side that some people can get a clear gear advantage this way (sure, there are gear differences now as well, but at least now you can farm outside ranked just fine to catch up). For pve side it matters less, except that few endgame raiders actually want to run ranked.
I still don't think new augments are even necessary, but if you really want to add them, you really should have it so that you can earn the materials for them from ANY content, sure, master mode ops and ranked pvp can earn them faster, but I and most other players I've talked have quite enjoyed the Onslaught gearing system in general. While there are optimal ways to gear up, you can pretty play the content you like and still be able to earn endgame gear just fine.