Huckabee is out. Bush and Santorum, Fiorina, and Christie will be gone either soon or just after NH. Carson will probably drop out after NH.
Paul is going to stick it out for a while. He'll come fourth, overall, and he'll benefit from a thinning crowd (the people who were voting for the above candidates are clearly not individuals who just want to 'pick the winner'). He'll get a spot at the convention, and probably a chunk of delegates, but will end up back in the Senate next year.
I think Bush, Christie and Fiorina dropping out will benefit Rubio the most. Carson, Santorum, and Huckabee will help Cruz the most. If Paul drops out, that'll help Cruz.
I honestly think that Clinton will win the Dem nomination, and it's currently a toss up between Rubio and Cruz for GOP.
If Cruz wins GOP, Clinton wins general.
If Rubio wins GOP, Rubio wins general.
I don't think Trump will win any state. I think he'll be a close second in many. Thing is, he's at 30%-40% in the polls, which puts him first. But he's a love/hate candidate. The remaining 60-70% won't side with him, even if their personal first choice drops out.