Not sure where you’re getting your info from, but CBS’ O&O stations in the U.S. are primarily on channels 2 (4 stations) and 4 (4 stations), with 3, 5, 7, 11, 12, 13 and 62 also used.
There would be no reason for CBS to shift to another channel number unless it wanted to ditch the Ten brand completely and start from scratch (unlikely at the moment). If so, it would only be able to use 1xx or 4xx.