The ACC was never going to land either Oregon or Washington as the Big 10 could get them whenever the Big 10 wanted (which is what they did and both schools will get more money from the Big 10 than the ACC could offer). The Arizona schools and the mountain time zone schools are a far better geographic and rivalry fit for the Big 12; also, don't see how any of those schools "fix" whatever football problem you are referring to. Colorado was the worst Power V program in the country in recent years; Arizona State is about to go on probation; Arizona has been a non-factor in football for decades. Utah has a solid program, but they are in Utah; they add very little in the form of media rights.
As was posted by Rambling Red earlier, the Big 12 wanted Stanford and Cal (they wanted to be in the biggest state in the union), and both schools balked. They wanted to be in the ACC, and were willing to sacrifice financially to do so. Not sure why people ignore how good Stanford football has been over the last 15 years. Stanford football recruits nationally on the most elite levels in every region of the country. Unlike the rest of the ACC, Stanford routinely beats Notre Dame (like last year), Stanford also routinely beats USC, and Big 10 teams.... in the Rose Bowl (kind of a big game; that's not something that Colorado or Arizona or Arizona State, ever do).