The Xbox is outselling the PS3 this holiday season so far because you can buy nearly 3 Xbox's for the price of one PS3. This is such a huge factor and in fact I am tempted to buy a 360 for £129.99 in the UK while the PS3 is £299.99.
If the Xbox hadn't cut prices then I would have expected the PS3 to outsell the 360 this Xmas, but that hasn't happened and the cut has.
Next year is a deciding year for the PS3, but don't forget, unless sales of the PS3 go down to ridiculous levels, I still expect the console to get a good 7-10 years of life.
Also, when the price eventually falls to £199 or even lower I fully expect 360 owners to start buying the PS3 as well.
Prediction (June 12th 2017)
Permanent pricedrop for both PS4 Slim and PS4 Pro in October.
PS4 Slim $249 (October 2017)
PS4 Pro $349 (October 2017)