But that doesn't mean College Football Conference = AFC Conference.
Divisions in pro sports were intended to be your regional rivalries, that you played every year. And by winning it, you got a reward (playoffs).
That's what "conferences" are in college sports. They still largely are regional. Expansion has changed that some, but the SEC is still mostly the south east The PAC 12 is still largely west coast teams. Etc. And winning them gives you a reward (the Rose Bowl, the Sugar Bowl, the Cotton Bowl, etc.).
You're too caught up in the language. Pro divisions are the equivalent of college conferences.
And I'm not following your MLB point?
There was and AL an NL champion at the end of the regular season. No "championship series" or other playoff rounds. Just win your league and move on. Even later it went to a division format. East and West in both leagues. Again, win your division, move to the LCS. TV and expansion ended that with interleague play and wild card games that make for really awkward references to October world series games as players struggle with snow flurries in November.
I get your premise and I would have agreed with you before expansion. Now it's just too difficult unless you're going to expand the college regular season or force conferences to eliminate OOC games. The B1G did that but it was more to support their product/TV network when they realized they already had a ton of fluff in the schedule. The ACC has the political footballs in Florida, Georgia, South Carolina, and Virginia to deal with. Plus Notre Dame. Don't really see any way the ACC kills and OOC game without affecting the TV revenue.