Wii sales will grind to a halt soon, low 100 million area I would expect.

Lifetime sales

360 - 88M
PS3 - 107M

PS3 will get continued support causing more lifetime sales and continued support in Japan for some time.

PS2 sold about 55 million after PS3 came out.  That accounts for about 33% of its total sales.  If PS3 is at 80 million by the time PS4 comes out it only needs 20 million to reach 100.  That would only be 20% of its total sales.  I think it can easily do that especially because it's not even at $200 yet which I believe PS2 reached in only its 2nd or 3rd year on market.  The only reason I see it maybe not reaching that is that it will have been on market a full 7 years by this Fall and PS2 had only been on market 5 years when PS3 came out, but I think PSN games will still transfer over as well as the big push of these last 1st party games.  I think a lot of second systems for the household will be PS3s in the coming years in America.

i think PS3 will see better support then 360,and sell better by about the same amount we see now..

i pray to god not to see another thread like this. now i'm off to go get on Jaywood's ass for making another thread topic i'm tired of seeing.