To the US (and the Japs) business wise we are in financial year 09 while in the UK we are in 08. Yup, very confusing indeed. Here were I work I have to do stuff on our UK system and also our US system, which have different current years. Not to mention US dates being all backwards!
As for the Wii, I guess hardware wise it's just moved into a new stage of it's product life cycle, just like all products do. Hardware sales are bound to go down at some stage, but as long as software sales remain strong I don't think there's anything to worry about.