Some time before the end of 2015, there will be a secret meeting with the Clintons, Chuck Schumer, and a representative of the administration (either Valerie Jarrett or Loretta Lynch). They will sit at a table, and the representative will, after a minute or two of pleasantries, ask, "Mrs. Clinton, what will it take to make you withdraw yourself from the Presidential race?" This will come as no surprise to the Clintons. Their price: no indictments or Congressional probes in 2016, a blind eye to any use of Clinton money, and pardons in January 2017. The deal will be struck: the GOP will go along because their candidate will be happy to run against any JVs on the Dem side, and the Dems will go along because they can wait four years to groom a better socialist candidate in the next election. Neither Clinton will live to see the 2020 election, however; if natural causes do not do the trick, one of the aggrieved foreign donors to the Clinton Foundation will make sure of it.
Very plausible.