One thought about Oregon in the Pac12. Oregon really isn't that close to Los Angeles. The distance is similar to South Carolina or Florida playing Texas A&M or Texas (which is some of the longer road trips in the SEC).
Geographically, Oregon doesn't provide that much of a closer opponent for travel purposes for UCLA and USC. This might be why Arizona teams have been in the discussion as well.
Definitely the constant long road games may hurt USC and UCLA similar to how they are hurting West Virginia in the Big12. However, at least they are a two-team instead of one-team combo.
Pac12 is pretty geographically spread out. This might be another reason the Pac12 tends to have more chaos in the league and less Elite teams. There is also not a lot of local teams to play OOC. I know this had to hurt the league both Financially and Competitively.