The proposed changes will lead to a huge recruiting boost for the top "G5" teams. Before, every player that went to a G5 school knew they never had a chance to win a championship. Now, a recruit is more likely to make the playoffs (and win the NC) by going to UCF or Boise than they are by going to Ole Miss or Baylor or Arizona.
So, if BYU wants to increase the talent of recruits, they need to join a conference and be a top G5 program.
Summary: Conference --> CFP --> Higher Recruits --> NC