Sony is currently facing a loss in profits in a fee divisions as well as overall, and its future success won't be stopped at all, here's why
1. PS Vita - the vita allows for online sales which generate greater profit margin, and another platform to port games onto, thus adding some revenue but little cost. Eventually, I think that the vita will rival the 3ds in sales but it will take some time, just like the ps3 was wanting to match the Xbox
2. Bluray- the ps4 won't be hampered by being so overpriced like the ps3 was, heck the 720 will have the same Bluray reading capability and thus a more similar cost than we had this generation. But the 720 having Bluray capability means that more blu players are out there, and we will have greater sales for them, increasing blu marketshare. Also, Microsoft will be paying royalties for the Bluray since its a Sony ip design.
3. Weaker msft and ninty??? - Microsoft is growing much more slowly than it was 7 or 8 years ago, so they won't beagle to just pour money into projects like they used to which has always been a strength for them. Nintendo isn't expected to have a great product for next generation either but this is admittedly a lot of speculation on my part. If anybody knows anything said about how good of a product the wiiU is supposed to be or estimates of future sales have been made, let me know...
4. Super slim ps3- the new upcoming super slim ps3 will have a lower manufacturing cost and be morel pilar in places like Japan that value space, as well as serve as Sony's product for the second and third world for 6 years or more. This new model will spur greater sales down the line.
