First, isn't Oklahoma going to say the opposite of what Texas says just by default? Is bringing in BYU and Cincinnati (hypothetically) any different than bringing in Utah and Colorado? Both situations are the same in terms of why and need.
Second, what does the league get? NCAA tournament runs. Top 25 football finishes. 14-1 in non-league football games as a member of the Pac-12 and an undefeated bowl record. I don't think the Pac-12 has buyers remorse any more than the B12 would be for adding whoever they're going to add...