We already got Wii Play, Wii Music, Wii Fit and Wii Sports (Mario Kart Wii doesn't count for this topic as it doesn't fit the total casual porpusal) and in the near future Wii Sports Resort.
Now what would we see from now on?
I would be terryfied if Nintendo makes a Wii Fight with a wiimote and wm+ bundled*, then we would play with 2 wiimotes for 1:1 punching and balance board support, with VERY realistic graphics, online play featuring WiiSpeak and worlwide competions just like Mario Kart, weather channel support in outdoor arenas for real time and location weather effects, and of course, support for the Miis. This with a pricetag of 80$.
What about you?
*hardware bundled = 3 gazilion sales confirmed