I agree with Captain_Tom. Think of it like this: Let's say you walk into Gamestop and you're looking for a new Mario game. It costs $59.99. It won't matter to you in the slightest if Call of Duty is suddenly $5 unless you're already interested in CoD. The only people who'll be swayed by the sale are people on the fence or people that wanted to buy an Xbox One, anyway.
The reason the Xbox 360 sold what it sold wasn't because of price (even though that did play a part in it). It sold because people educated themselves about what it had to offer and it became something that they wanted to own. What Microsoft has to do (and they've been doing this in my opinion) is make the Xbox One a device that people want to own. Offer a comparable experience to the PS4. Offer better games or at least offer games that can't be missed. THEN, people will buy it.
If the only factor was price, the Gamecube or the Wii U would have set the world on fire. iPhones sell for a crazy price because people like the brand. M$ has to restore people's faith in the Xbox brand.
