The Big Ten has been open to expansion for a while now. Bringing Penn State and Nebraska aboard made a ton of sense. Some may argue that Rutgers and Maryland were a bit of a reach and the thought they were going to drag in the NY and DC TV markets was not exactly on point. Now, the Big Ten is a national conference with the introduction of UCLA, USC and just this weekend Washinton and Oregon.
The PAC 12 failed to get a TV deal and all the programs ran to other conferences. Arizona, ASU, Utah and of course Colorado are heading to the Big 12.