If Trump nukes Carson fairly soon (if he even has the means to do so), it will be interesting to see where Carson’s voters go. If they go to either Cruz or Rubio, then Trump may be sorry that he took Carson out so soon.
Trump has never been accused of being stupid. If you follow poll numbers history, Trump has been stable around 25, Cruz has been stable at 7, Rubio has gained, Bush, Kasich & FioRino have lost, and Carson has surged.
It is elementary Dr. Watson (to quote Sherlock Holmes) that Carson’s votes have come from Bush, Kasich & FioRino.