Which SEC team will crash and burn by season end ???

I think we have already crashed...
Alabama has the highest risk of the west team. USC is another big candidate, if Lattimore doesn't return soon.

LSU, followed by Bama and then Auburn.

LSU because they have had two subpar seasons in a row coupled with Les Miles curious coaching throughout this season. LSU fans have been in meltdown mode all season and LSU is undefeated. If LSU loses three games (a real possibility), the program could begin to come apart at the seams with a great divide over whether or not Miles should be the coach of LSU going into the future. Despite a more positive mood around here since UF, LSU has narrowly escaped being a three loss team right now (UNC, UT and UF).

Bama relies on defense to win and their defense is good but not great. Their offense has slowed as of late as well. I could see them losing to LSU and/or Auburn and being given a solid game by MSU. Lose two of those three and you have a massive meltdown from crash and burn on your hands.

Auburn has two things going for it right now...confidence and blessings from the SEC gods. By blessings I mean luck. They should have/could have lost to Clemson at home. Should have lost to USCe at home but for Spurrier's ego overloading his brain. They were given two TDs that changed the complexity of the Arky game. They narrowly excaped UK with a win too. Last year Bama had all of the luck and confidence therefrom. This year it appears to be Auburn, but they are not as talented as 2009 Bama. I could see them losing two or more games (LSU, Bama and maybe UGA). However, their expectations are not that of LSU or Bama, therefore not as big of a crash and burn.

History typically tells us South Carolina.