IMO, no, Texas would have always wanted more than everyone else, which would have just caused the same problems with Nebraska and OU. Maybe Nebraska wouldn't have been so quick to jump ship, but they never were going to get along with Texas. The one thing I will say nice about the Big 10, is so far, they have shown they care about The conference as a whole. That may change, but so far it's been about raising the conference, not let's see how much we can grab for ourselves.
I don't think they will blow up the SEC like they almost did with the Big 12, but in the not so distant future, they will cause problems in the SEC. Texas can't stand to consider themselves equal to anyone, let along second fiddle. And if they do somehow become the top dog, you better be sure Texas will make sure everyone in the SEC knows it.
Texas has massive wieght to throw around but the SEC wont care.