The article gives Trump too much credit, IMHO.
Most People are fed up with the Bushes. Most of the GOP primary electorate either agree, or are smart enough to see it and know that Jeb would be a terrible candidate.
Trump isn’t pulling support from Bush. He’s pulling support from voters who would have otherwise supported Walker or Perry or Jindal, keeping them in contention. So the Trump effect is really the rapid winnowing of the GOP field down to four top contenders. Of which Jeb isn’t, and wouldn’t have been, one.
Well past time for Jeb to fold his tent and go back to the Florida sands and sunshine. He’s already toast.