SAM is strong but aside from everything, that's all SAM offers to a group is it's damage potential. The other DPS jobs have numerous utilities to support the group. It is too early for me to tell, but raw damage over mechanics and synergy with other jobs may not be an A+ strategy in certain cases. In the event that it does happen, SE will just buff the other DPS jobs that aren't being chosen for raid content. It's a never ending new meta in FFXIV.