Even though CBS owns Trek, the odds of a Trek series actually airing on
CBS is about zero. Aside from the decades-long argument that science-fiction (in particular, spaceship-based) is too expensive and too difficult to produce, Trek is just one of many properties CBS acquired from what was formerly Paramount Television. You're more likely to see a revival of something cheaper and easier to produce like The Beverly Hillbillies
or Laverne & Shirley
on CBS rather than a Star Trek series.