Actually, since it's the release week of Anthem, wouldn't the PS4 be supposed to be on top normally? I'm pretty sure any previous year the PS4 would have sold at least 50k more, Anthem flopping or not.
I do think the gap will grow pretty fast in slower weeks
At this stage of a console's life, individual titles don't really give notable boosts to hardware unless it's something truly huge.
When the herd loses its way, the shepard must kill the bull that leads them astray.