The NFL only plays one game in February, and college football knows it cannot compete with the NFL.
But looking at this as rationally as I am comfortable doing, given that we're discussing college football:
A. No one in charge seems particularly eager to even expand the field beyond 4 for the foreseeable future (i.e., the current contract, which runs through 2026).
B. Even if the money dictated that expansion is in everyone's best interests, the current structure's latest championship game occurs on January 13, and it's only that late because they have determined that Monday night is the best night for a title game (see: "not wanting to compete with the NFL," I assume) and are comfortable with an 11-day gap from semifinal to final. In keeping that same general process, opening playoff games on 13/31 and 1/1, subsequent rounds starting on the first Monday that is six or more days after the semifinals, and continuing on from there) it would take a 32-team field to push it into February.
C. Avoiding head-to-head competition with the NFL - especially during the playoffs - would require Thursday/Friday/early Saturday games, which are fine for the regular season, but probably don't bode well for attendance and tv ratings in January.
I get that pessimism is your thing and all, but this particular "fear" is misplaced, IMO.