I think the Sunday issues has always been in play with BYU.
The simple facts are though, that Arkansas and Nebraska to the Big 12 would make for an extremely attractive media package. While Arkansas and Nebraska aren't huge TV audiences they are captured audiences. Arkansas in particular would immediately put themselves in much greater contention for a conference championship and they would be able to recruit Texas with more in their bag of tricks than ever, with the vast majority of their games played in AR/TX/OK/KS. A huge selling point to parents, huge.
Yeah, forget that East/West thing if Nebraska were to come back. North/South it is.
A pipe dream for sure, but a fun one.