both can sit pat and have no real need to expand or change members. If there's any more movement, therefore, it's likely to be in discussions between the P12 and the B12 remnants. But even that's not a given.
Which is why the very next realignment move is going to come out of left field and be Notre Dame and BYU joining the B1G. Obviously tongue in cheek, and it's not going to happen. What could happen, though, is Clemson jumping ship on the ACC and joining ND as a pair to the B1G. Then it puts the whole ACC on shaky ground with the B12.