You are correct NOW, but when Oregon and Washington told the league that they were leaving, on the heels of Colorado already leaving, then was the time if Stanford or Cal wanted to move to the B12, that the league would have taken them. Worth little or not, taking two more teams from the P12 and their academics would help the look of the league.
Neither school saw the B12 as an option, so they quietly told the league "No" is what I would say happened. Do really think that if Stanford approached the league Monday morning that we would turn them down? Why would they, until the ACC teams are free, Stanford is the cream of the crop for the league to pick up, and now you could do it on the cheap.