No expansion. Maybe some swapping but I think the SEC will pretty much stay as is. There is no reason for them to expand as the SEC is already the most dynamic conference.
No, Hell No and Absolutely Not is my resounding answers to this question regarding what the SEC "should" do. The SEC is the big dog and has the best set of schools, with the exception of Vanderbilt in any football driven conference. The expansion talk will come up again when one of two things happen. 1) Notre Dame picks a conference which will be the Big Ten. 2) The Big 12 (minus two) dissolves, which it will. The SEC will only look to expand if it feels a financial obligation to the schools to do so and to not let other conferences completely out-do the SEC in the revenue sharing pot. The Big Ten is the biggest concern for the SEC from a financial perspective. They are already paying out slightly more than the SEC is, but if they were to add a Notre Dame to the lineup, that payout would go up significantly and would force the SEC's hand to expand.
The SEC will only expand into markets where it is not currently in, which really only leaves one real direction, West. If the SEC were forced to expand, it should go get Texas, Texas A&M, Oklahoma & Oklahoma State. Texas is the diva school of the West, and it has burned its bridge on the expansion move to the West Coast and will be left begging to be picked up by the SEC, which I'm sure the SEC would be happy to oblige. By adding schools to the conference, it sets up an automatic renegotiation clause in the current TV package deal, and the SEC will not play second fiddle to anyone, especially the Big Ten.
No. One million times no. I'm not going to take sides on whether the college or NFL product is better; both offer something the other doesn't. Rivalries are great in college sports. They are particularly great in college football and the SEC has more of the great rivalries than any other conference. The other schools are not conference opponents, they are the enemy and they need to be crushed, destroyed, killed, and then punished. There are rivalries in other conferences that rival the SEC rivalries but there are grudge matches littered throughout the season in the SEC. Expansion dilutes a big part of what makes the SEC special.