Moneybombing barely worked against a bunch of jokers in 2012. If Romney had lost Michigan and Ohio... imagine that. Plus I think Walker's strategy would be for an early state KO. Win Iowa, overperform in NH, win SC. We know from 2012 that the elites are fickle if their guy takes serious damage - hell, Barbour and others were talking white knight during primary season itself.
This is very true. People tend to forget that the establishment was ready to drop Romney like a hot potato if their Christie/Daniels draft campaigns succeeded.