Is there a fan base in the NCAA that thinks more highly of itself and its athletic "accomplishments" than Texas A&M? Don't get me wrong, it's great to be wanted and good for them if they've got another place to land, but it's not like A&M is some powerhouse. In fact, with rare exception I'd call them a perennial underachiever.
Doug Gottlieb tweeted this morning: "Texas A & M can win Big 12 any year due to resources/talent, just another school in SEC." That might be exaggerating but it's not far off. And it underscores how little A&M has accomplished that even in "just" the Big 12 they've been no better than mediocre for nearly the conference's entire existence.
If A&M underachieved in the Big 12, they will fade into athletic obscurity in the SEC. Other than a pure ego play, I can't see why this is an attractive long-term move for A&M.