There's really little doubt that Wii will outsell the PS2.
It's tracking above the PS2 (launches aligned)
Still sold out in places after more than 2 years (!)
Broke record for best US November ever
Is on track to break record of best US December ever
Shipment target April 1st 2009: 52 million
Monthly shipments now: 2.4 million
Still at launchprice
Single SKU since launch
Only now are we beginning to see a shift from 3rd party devs towards Wii