I think it will get to 100M but not 115M. The ps3 has the advantage that the ps2 is currently in use in a lot of developing countries as the cheap gaming console that has a huge library and a dvd drive. Once sony discontinue the making of new ps2s, which they will once the ps4 arrives, those same developing countries will be more likely to switch to the ps3 which will have IPs they are familiar with. The blue ray drive and the cheaper price than current (since the ps3 price will likely be cut soon) will also help with this, as will the countries' own development which will likely see rising middle classes adopting slightly more expensive consoles than the previous gens.
I also think the ps3 will likely sell 10+M next year - while sales will probably be lower than 2012 the exclusive games and the likely price cut should see the ps3 well. And if the ps4 lacks backwards compatibility (which imo would be a mistake) like the rumours suggest then you will see a lot of demand still for the ps3.
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