If Nintendo includes a mode in the game which is highly likely to be bitched about incessantly, it's going to cause them headaches and unneeded headaches at that, especially when I don't see anyone here or anywhere else clamoring for an online tournament mode or shaking their fist in one of those "They better have online tournaments, or else!"
And just so I'm clear on this, I expect that each unique person that I play with on SSBB will, JUST like Mario Strikers, only be feasible if I can accept or reject the connection based on the quality of the connection I have to them. Without this, I'll be connecting to people who may be close enough to the person hosting the tournament that they don't experience lag and I'm close enough to the person hosting that I don't experience lag, but when you combine the two distances, you get a 1.5 second delay on everything, meaning that the whole point of having a "tournament" (which is determine who is the best out of X number of people) has just gone straight out the window because the odds that every person you play against in that tournament having an acceptable connection are pretty slim.
Remember that Sakurai did not include an online ladder/ranking system for SSB online for a REASON, and that reason probably stems from the fact that taking fighting games online is generally unreliable and SSBB will, as far as I know, be the very first to attempt to do so with four players.
Online will only work in situations where the two connecting Wiis can agree to connect because the connectivity between them is good enough. That goes out the window when I'm pitted against a bunch of people I didn't pick to fight. What am I supposed to do? Reject the next guy up because his connection sucks?
Nintendo wouldn't be likely to spend the time and manhours on something which just cannot work with latency issues and is more likely to be bitched about than appreciated.
This isn't negativity. This is approaching the concept from a design standpoint and pointing out why it's a bad idea to get your hopes up for it.