I think you're kidding yourself (and your readers) if you think this ends Kiffin's honeymoon. Read the responses to the news of BJ leaving, and the majority of fans seem to be saying, see ya; don't let the door hit you on the way out.
The argument that the coaching staff wants to make it more appealing to potential recruits by getting rid of the sophomore and starting the senior doesn't hold water. This year is an audition for Kiffin's offensive system in the eyes of all big time qb's. This offense needs to succeed, or at least show marked improvement this year, and you do that by putting the guy who you feel gives you the best chance of that, regardless of what class that guy is in. If this year's offense looks like last year's offense, it won't matter who the qb is; no top recruit will want to put himself in that position.