BHR-3 keeps badgering me... so... when could PS3 overtake 360?

[Reasonable]

I expect PS3 to overtake 360 WW towards the end of this gen.

By then a new Xbox and possibly Playstation will either be arriving or about to.

I expect 360 to retain lead in US over PS3.

I expect PS3 to have big lead in Japan by then and decent lead in Others

I expect Wii to be ahead in all territories.

I might change my mind once I see what impact (if any) Move and Natal have.