PS4 will basically always have the multiplat advantage. Even if the XB1 gets permanently price cut to below 400$ the fact that it has better hardware and that the architectures are very similar to PCs, gives it an advantage. The only way XB1 can truly compete is marketing, sales, and exclusives which was PS3's Modus Operandi last Gen.
Furthermore, PS4 will become cheaper earlier then XB1 in terms of manufacturing costs because factories to manufacture its RAM are being built.
Marketing and Sales even are MS' strong suits, but Sony has the advantage of Exclusives as well, which MS is scrambling to match since they realized that they lost the 360's advantages.
PS4 like PS3 seems to have slow start, but PS4 is bolstering its catalog with indies, something the PS3 didn't do until the end of the gen. If Xbox does not invest in development, (ID@XBOX and buying Exclusives) doesn't count, then once PS4 gets its exclusives, XB1 will be completely relegated as an expensive media machine that requires XBL to work.
Exclusive+Multiplats+Indies is a total game advantage, even the ps2 didn't have indies.
Betting on the casuals was a mistake, its like chasing a rainbow.
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