If you believe that if PS2 was removed from the market tomorrow that doing so would not cause an increase in PS3 sales, then you are welcome to that belief. I disagree (not 1-1 tho, of course).
I agree. (... not a notable increase in sales of PS3 however, more likely an increase in Wii sales)
I think MS really forced Sony's hand releasing in '05. Sony could have ridden the PS2 into this year and had the PS3 poised for WW release this month in a much better position from a cost/price/games/services/features perspective.