Apparently you didn't read to the end of the article, with the link to Shatel's column advocating the opposite view. Herbstreit thought the move made sense, as well as Barry Tramel from Okla. These aren't SEC writers.
The ones strongly against Mizzou to the SEC are KC tourism business interests (who don't give a rip about MU) and message board posters from schools who might be adversely affected by the move (who REALLY don't give a rip about MU). Most everyone else is OK with it.
I didn't think McKeowan's column made a lot of sense. Why is Mizzou to the B1G such a "sure thing." This is a conference that lived with 11 teams for more than a decade. They're not going to expand unless ND wants in (which is probably never).
We only border 3 major conferences. One doesn't want us (B1G). Another has lost 1/4 of its members in the past 18 months. The third is the SEC.