What they really need to do is implement external USB hard drive support. I can't believe Nintendo designed the Wii with such limited internal memory. In this day and age of video gaming, everybody knows data storage is an important aspect of a video game console, with all the downloadable content that is available and the multimedia capabilities of systems.
Microsoft did it right with the Xbox. Even with the stock 8 GB Xbox hard drive, you could have saved games for every Xbox game in existence and have plenty of hard drive space left over.
I really hope Nintendo is working on USB hard drive support. It's the most convenient solution to long term storage.