I think it will all come down to the things that are happening right now. If the players are not working their butts off getting ready for the season, but are loafing then a 5-6 win season is very real. If the players are busting their butts and developing the physical tools needed to compete then an 8-9 win season is very real.
I am more likely to expect the 6 win season. My experience with BYU students of late is a bunch of whiny, entitled brats....if that culture permeates the football team then 6 wins is reality.