last year, that ND will eventually end up in the ACC because that is where they have always wanted to be, and that the ACC will never be going anywere.
It will also be NJersey Coug who tells you that within five years, ND will be a full member (meaning football) of the ACC within five years.
As for BYU, ND to the ACC will only help the chances of BYU to the B12, but the B12 is being stubborn right now. Don't expect any news until after the football season, possibly not even until next spring though!