85m by 2011, 100+m by 2012, likely 115m by 2013...if the Wii successor is not released before 2013 even more...and it will not stop selling. I think 130m LTD is quite sure. More is difficult to predict, we don't know what games will be released, if there will be a Wii Plus (like DSi) or if the successor launches soon (2011-2012).
And it's right to compare home console with handhelds, like this gen demonstrated just some handhelds sell great and the Wii started its life selling better than DS so I don't see why is not fair to compare PS2 to DS...