I can't imagine BYU going anywhere but the Big East as a football-only member.
I could still see the Big 12 being an option since the money would be there. Problem being the lack of quality western schools for #12 and that it pushes the footprint the wrong direction when the big guys are all looking south/north east.
Pac-12 seems like a stretch at this time due to the academic/religious aspect. But money is ultimately the top religion and if adding BYU could make money for the Pac-12, I think their stance could change in the future. Likely? No, but still has to be a possibility to consider.
I'd disagree about the money/religion part.
BYU (much like Army, Navy and Air Force) have a different set of ideals as the other college athletic departments. BYU-TV was the religious mission of their school president. He feels he's called by the Lord to spread the LDS message through BYU TV and have BYU athletics serve as an embassador for that.
The reports of BYU re-thinking independence stem not from TV revenue, but from BCS bowl access. BYU could be a BCS Bowl At-Large if they won 9 games and were in the top 14 of the BCS. Under the new formula, they have to be in the TOP FOUR.