PS+ lost some of it's flair has more and more people make PS4 their console of choices and putting away the PS3.
The Vita free games is hardly a factor anymore, in the US the install base is 2.5 to 14 million when comparing Vita to PS4.
GWG is offering a potential of four game to Xbox one owners (Thanks to backward compatibility) (But Xbox one owners must also remember that we have Sony to thanks for starting PS+ and forcing Microsoft to give us GWG). GWG is a product of Sony in a way :)
Tommy Jean, CPA, CGA