By now a lot depends on Wii 2. Provided it doesn't kill PS3 and 360 very quickly, I can see PS3 doing at least some 14M 12M 11M = 37M in the next three years, including this one. (And no, I haven't checked actual sales lately, only the order of all consoles.) That would bring PS3 to some... 82M (if PS3 was at 45M at the beginning of this year) by the end of 2013. I don't see why it couldn't reach 18M more during the rest of its lifetime, bringing it to over 100M units sold. So yeah, my bet is 100M-110M. Not bad for a console that launched at $599, was at the last place for most of the generation, and generally struggled during its first years.
That said, I haven't checked actual figures before posting this so I could be way off. Also, if Wii 2 has a serious impact on PS3 and 360, things will be a lot different. Naturally Sony discontinuing PS3 quickly after the release of PS4 would have a similar effect but I don't see that happening.
