Wii has a chance ...
Though remember PS2's LTD shipments are 130 million (as of 31st March 08).
If SONY achieves its goal of 10 million PS2's shipped in 08 ( which it should easily / it's a 30% decline in sales) PS2 will have 140 million shipped ...
expect SONY to then ship another 5 to 10 million before ceasing production of PS2 ... which gives PS2 145-150million in lifelime sales.
If Wii can pass the 150 million consoles mark then it will have some truly amazing sales -- especially with 360 and PS3 expected to outperform 2nd/3rd placed consoles (most 2nd/3rd placed consoles don't pass 20 million ...) That would mean huge industry growth.
I think Nintendo should aim for PS2's immpressive software sales -- it has like 1.3 billion in LTD software shipments which is incredible ...