If the lose the Star Trek license, I find it more likely it will be after the current contract expires rather than having it pulled prior to that. At the very least, this latest contract was more complicated than usual, Trek novels were essentially suspended for an entire year while the contract was negotiated. It'd be a very terrible situation if they spent all that work on the contract just to have the license pulsed before the contract was up.
So often how that works is even as a Strategic Business Unit (its legally a subsidiary I think? ) - S&S was expected to be competitive and tender against external companies to provide best value for the parent.
*however* given CBS-Viacom are (AFAIK) 100% owners - if they want that contract to go *puff*, it will go *puff*!