The plan behind this is to have only one establishment candidate remaining by Super Tuesday, while the conservative field remains fractured, so that moderate GOP voters could coalesce around that candidate and help him sweep the southern states, thus, practically, securing the nomination.
As part of this plan, we should expect several establishment candidates dropping out after Iowa and New Hampshire, and all but one dropping out after Nevada.
I'm not so sure that the 'establishment' candidates will all cooperate as well as you think. These people are trying to become president, and I don't think they'll just bow out if they think they have a legitimate chance.
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