The Silver Star and the Silver Meteor differ in their passenger mix. Many Meteor passengers ride between NEC points and Florida points. The Star tends to be heavy New York - Raleigh and heavy intra-Florida but light between Raleigh and Jacksonville. That's not always true but it often is.
In addition, CSX has often sought to downgrade track and eliminate signals between Cary, NC and Fairfax, SC. The Star is the only thing that prevents CSX from doing so. I can't imagine that CSX has any enthusiasm to install PTC Cary-Fairfax.
Without starting rumors, I wouldn't be surprised to see the Star's sleepers moved to the Meteor. Nor would I be surprised to see the Palmetto re-converted to the Silver Palm and extended south of Savannah, using the Star's sleepers and diner. Nor would I be surprised to see the Star split into two day trains, one from Raleigh northward and the other from Jacksonville southward. The only stations that would be sacrificed in such a split are Southern Pines, Hamlet, Camden, Columbia, and Denmark. Of those, only Columbia has significant population -- but one can argue that a single train calling at 2 am and 4 am isn't much for Columbia to lose.