I agree with what you are saying. Now is the time to make moves and not sit back. I would invite Texas and Oklahoma first. Get into a bidding war with SEC. If they show interest try to get Notre Dame and Kansas to join for an 18 team conference with 9 in west and 9 in east division. While many probably don't want Texas in mix - I say do it.
If Oklahoma and Texas join SEC, then raid SEC with invites to Missouri, Arkansas and Texas A&M (the teams likely opposed to said move). Try to get Notre Dame to join, if not Kansas.
At least these scenarios should be discussed in Big 10 office.