Due to the “type” of sport we’re dealing with here, a “prolonged” playoff is neither warranted nor practical, IMO. This format is likely the best available due to the “extreme” nature of the “sport” and the “extreme” nature of the violent contact involved.
Consider that reality before demanding an imposition of even more match ups to decide a “true” national champion.
Keep in mind that most of these “unpaid” young men have their future to consider as far as staying healthy in order to secure a spot in the NFL, which is where they will actually “bring home the bacon”.
Division I-AA (FCS) has a 24-team playoff.