Ohh come on. You and I both know that Mario Party 8 NEEDS to be online
Just like when we look at Smash bros. and say, "This would be great online". The same is true for Mario Party 8. When you look at reason's games are delayed, it's not to add some more mini games or something small. We all know in order to blow the competition out of the water,
Wi-Fi on Wii must come out throwing some punches, and to do that you need the most Grade "A" games on day one that has online. It would stir up support for the system and encourage 3rd party online games.
With a popular game like Mario Party, there is no reason why you would want to make the mistake of not making it an online game