Beet I like you but you get worried way too easily. Clinton will give Sanders a good thrashing in the debates, win Iowa by 30% and that'll be that.
Except she's a horrible debater and Bernie will be able to set the tone and direction of the debate because he can stake out positions she cannot. She's only going to drop more in the early state polls.
Exactly why a large majority of the Democratic debates ended up with Hillary winning in 2008. Bernie on stage will look more like Mike Gravel than Barack Obama.