I am going to say 70 million LTD and that includes sales when the next gen consoles release (duh LTD duh). Whenever I see a reason the PS3 selling badly, it being discontinued (LOL), the 360 selling better then it and will keep doing so is.................PRICE! (Wii does not sell because it is cheap it sells because it is awesome)
One time or another the PS3 will be £200, £150 etc and that is when I assume sales will pick up immensly, people say "LOL PS3 still screwed because the 360 will be even cheap" but the price will be mainstream, people will not mind paying £200 for the console (unless poverty stricken). I also see the PS3 being compared to GC which managed 30 million , pretty crazy a comparison when the PS3 is 4x the price the GC was. So 70 million LTD, even if the next 50 million come with a McDonalds kids meal that is the number I expect it to reach......AT WORST.
PS for me LTD = life to death, seen other people do it so why not >_>