My personal bet is that it will happen around Christmas 2009.
This Christmas the boosts will be relative, so the PS3 could catch up by over 100k per week (Christmas being last 6 weeks)... then in the new year it will natuarally fall back down to 40-50k per week, but slowly increasing across the year (PS3s 3rd year and X360s 4th) to nearly 100k per week by November... then a bit more to finally catch up during December.
If not then then it should manage it within that fiscal year (before April 2010)








