You should be very afraid Rugby, you're actually agreeing with ME now! I've said from the day Whis announced it, Leinart would be better off psychologically as the underdog. Combining the pressure of holding onto the #1 spot, re-learning his footwork/mechanics, re-habbing his injury, still learning the system and re-establishing(establishing?) timing and rhythm with the receivers is just too much to ask when there isn't full support from the team, coach, fans and media. If Warner was say, Tony Banks, then there's no polarization of opinions.
Whenever there's a QB controversy both QB's, the team and it's fans all lose. Even if Warner is named the starter he'll have to look over his shoulder as well and every error he makes will be over-scrutinized by those that think it would be better for the team to deal with errors by the young guy. Warner won't be able to play "his game" and the problems will become self-fulfilling. Hopefully one of them can rise above it but it's really not the "good problem to have" that some consider it to be.