Two DRC support is already cool strictly for games applications, but imagine the Wii U being the social, multimedia, high-tech hub in your living room: your 50 years old mum cry in front of Desparate Housewives displayed on the TV (through Netflix), your little brother is drawing a gothic cat with spikes, black & red fur, on the first DRC (Mario Paint/Colors!), while you play Superman 64 in the virtual console on the second controller.
Wii U will really be the "project café" as leaked first, like 3 friends ordering different drinks and meal BUT reunited around the same table.
It could be huge if they'll get it right in regard to OS, system features, services, etc.