They would immediately be #2 in student body size. 19,500 on campus plus 60K online. They get nearly 7K at their home games. So, we could have at least two conference road games each year with 6K+ attendance.
And, it would give BYU consistent games in Phoenix, a BYU alumni and fan hotbed.
They've had some decent RPIs in the past 3 or 4 years. Usually better than at least 4 or 5 WCC teams.