I dunno, I think Sony actually DO need to provide some kind of bundles/price reduction if they want to stay ahead in the US; Xbox One really isn't that far behind and it's got one of the largest entertainment franchises coming out in a few months (Halo).
I wouldn't be surprised is Microsoft pull ahead in the US by the end of the year. If that happens you'll be hearing an awful lot of PR coming from them. We generally hear an awful lot more about US sales compared to anything else and in the minds of a lot of people that could mean that Xbox is 'winning'.
Regardless it's all good for competition.
Will probably be pretty tough, I think PS4 is already 770k ahead, with July/Aug/Sep to go before holiday which MS won last time by 640k. So if we assume PS4's lead will grow by November, and we assume XBO will win holiday by the same amount, XBO wont forge ahead. So far July is not looking good on Amazon for XBO either. June sales were pretty healthy but it seems most new XBO bundles are the 1Tb 399 ones. MS is trying to stealthily push the ASP back up that I can see, but it may backfire on them eventually if consumers start to perceive the only good XBO bundles =$400, therefore the defacto price is $400, therefore advantage PS4.
I wonder if MS is trying to keep it's powder dry for a "temporary price reduction" blowout of $329 or even $299 on holidays. I think at least the former is at least plausible. The latter a stretch.
It's just as I predicted, with apparently somewhat underpowered hardware MS is in that unenviable position where the only real way to gain sales is painfully slash prices. "Cheaper" hardware costs way, way, way more. Billions more.