I bet Mizzou would rather be a B10 member.  Better all-around fit here than the SEC, IMO.  Then again there may be hard feelings after we skipped right over them to get Nebraska.  Even nowadays, a true border state (belongs to both East and West, and North and South).
I wonder if the B10 will counter at all... It is quite possible that 12 schools is exactly where we want to be.  I think adding Notre Dame and Missouri is the optimal way to add two schools.  If it is 4, let's take Notre Dame, Missouri, Maryland and Pitt.  Personally, I hope we stay right at 12 awhile and see how it goes.
Hopefully, the SEC adds only A&M and FSU.  I don't want the Big10 to be forced to have 16 teams just so we can keep up with the SEC.