Here is where I am at on the whole wanting to join the Big 10.
I was/would be totally happy with the Big 8. If money was the same regardless.
When the Big 12 happened I started liking it less, but was still fine with the old Big 8 all still together.
Once half the Big 8 left the Big 12, and the distance and regionality was thrown out the window, I no longer really care about staying with the peers.
Moving to the B1G now would be just a survival and financial thing. During the B1G west years there would not be a better conference to be in and I said so often. Considering every single opponent would have been closer than our closest opponent in the Big 12. (if Purdue was moved to East with our entry, Purdue is barely further than KU, the rest of the B1G West were closer) But that is pretty much out the window now too, although they still have many more teams closer to ISU, than the Big 12.
Would I want to go to the B1G with all things considered and the current situation of College sports, if offered. Of course. Would I be totally happy, no probably not.
That being said, It is never going to happen in my lifetime without a complete blow up of the entire system, so I dont really worry about it. I personally think ISU has a better chance of getting invited to the SEC than the B1G. And that chance of an SEC invite is microscopic so the chance of getting invited to the B1G is more like a nano particle.