You heard it here first. The Jazz will not trade either Jefferson or Milsap this year. They may make a trade, but it won't involve any of their frontline players.
They will ride out the season with the status quo, resign Milsap in the offseason, and let Jefferson go or arrange some kind of sign and trade (or other fancy arrangement).
I'm less certain about the second part of my prediction, but I'm willing to go out on a limb about the first part.