its impossible to assume much. While the playstation 3 will be the console of choice for developing countries once its price gets lowered to ps2 type prices, western countries will be a different story. PS2 was the console of choice for all people from the United States, Europe, and Japan on a budget. It was the completly dominant console period. This generation it will have to compete with the wii in Europe and Japan, and will pretty much has no chance against the xbox 360 and Wii in the United States if trends continue.
The price factor is also pretty silly. The mass market price is different for every product. I'll make a pretty simple comparision. A laptop has a much higher mass market price than a netbook because of the technology inside of it.
Its not like sony is making massive profits on ps3 sales. They are selling it for around what it costs them to make it. A playstation 3 now is more advanced tech then the ps2 was 4.5 years after its launch. Its mass market price is higher because it has more value.
It will easily surprass 80mil. Anymore depends on how much support it ends up recieving from third parties once next generation begins. The ps2 has been alive for the past 5 years because of the amazing third party support it continues to receive, not because sony themselves are still actively promoting the console.
