will they schedule primarily between the two conferences for P games or will they still include ACC/B12 in the future.

What do you think will happen? Will they try and only play each other? It artificially separates everyone and it starts to result in thinking SEC is better because they have always been better and you never see a comparison of the teams beyond the CFP and bowls

Right now BYU has the following SEC/B10 games scheduled in the following years

H&A 28/29 Ole Miss
H 32 Michigan St
H 35 Missouri