A couple random thoughts.
1- This is a message board. Speculation and hypothesizing is what fuels it. I think that if you enter a thread about realignment you need to expect it. If wild ideas and concepts, along with realignment-driven anxiety, are not your jam, I'd probably find a more concrete thread to visit.
2- As most of you know, I now follow Arizona football pretty closely and have been paying close attention to how they react here. IMO the PAC-12 deal is pretty shite. Massive dependency on subscribers for teams to make any real $. I suspect Arizona knows it's best path forward is taking the guaranteed $31 mill per year from the Big 12 (which is a solid deal albeit not near the two big conferences). But they also don't want to be the ones solely responsible for "killing" the Big-12, so they likely want to get ASU and Utah on board as well. Last night the AZ board of regents held a special executive session (oversees Arizona and ASU) purportedly to discuss this. We will see what happens.
IMO, Arizona, ASU, and Utah are going to opt to join the Big 12, ultimately ending the PAC-12 as we know it.
3- I don't know what the best path forward for the ACC is but as I see it, the answer is not sitting idly and doing nothing. That doesn't mean overreact, but certainly consider all options. If the PAC-12 dissolves I would absolutely be reaching out to the PAC-12 leftovers and exploring a western division of teams including a half dozen or so of the western schools. I'm not saying I definitely add them as it only works if the dollars work (and they may not want to anyway) but you really do need to kick the tires on all options right now. As it stands, if (and likely when) the PAC-12 falls, the ACC is probably the 4th out of 4 major football conferences remaining. Not an emergency, not even a short term problem, but definitely and intermediate- and long-term concern. And waiting till it is an emergency will ultimately result in the fate that befell the PAC-12.
Again, just my take.