I think PS Plus is a sustainable model, as long as people keep subscribing. This kind of service is sort of like an insurance policy, you need large number of people to do it. What is the magical number we dont know, but based on anedoctal experience it seemed to have taken off, especially in the online sphere. Personally, I had it last month SOLELY for the PS Vita offerings and I am very satisfied. I downloaded the PS3 stuff too but dont see myself playing them too much. I even bought a 32 gig to fill up my vita games, so on that front I had spent quite a lot on PS Vita, which I wouldn't have if not for the amazing PS+ offerings.
Ask people to pay, give them free games that they wouldn't have otherwise bought. Its the smartest idea coming from Sony this gen, and simply expose how much profit MS is earning by charging people to play online. If Sony can afford to give out free games for subscription, so can MS.
Its also about mindshare. I find myself looking forward to every PS Store update now more than ever, and have been thinking of spending some money on PS classics to fil up my vita. My vita which was dusty before last week, gets played every night now.
