Multi-port titles should remain strong atleast through the year. There are a few Wii/PS2 titles that might end up having a good shelf life. I am sure that releasing budget/cheaper games on the Wii, and porting them to the PS2 could be a very lucritive venture for some companies (manhunt 2, heatseeker, ect).
We might even see Madden 09 for PS2 still. That'd be amazing.
Back from the dead, I'm afraid.