DSi isn't a huge graphical leap above the DS, and isn't HD. It just lost zillions of GBA games and replaced them with a handful of DSiWare games, so it's not really worth it.
Unlike the DSi, a Wii HD would piss me off, and make Wii development costs skyrocket, destroying the Wii's greatest advantage.
I don't believe in Wii HD. I think Wii will get a true successor later on.












