Speaking personally, I just hate how football is moving towards a numbers orgy and losing a lot of the personal aspects. I'm sure this makes me old or whatever, but I enjoy hating the Falcons and Saints almost as much as I love watching the Panthers. I really dig having rivalries and hate that current pro football is moving away from them.
As an example, how bad ass is it that the Cowboys and Redskins get to determine who moves on with their last game tonight?
Anyways, I see your point(s) above. I agree with needing an expanded roster but would be pretty bummed by replacing a divisional race with a conference one, which is the whole point of the current playoff system.
Worse than that is the rules changing to be complete bullshit. If you are old then you definitely hate the stupid can't touch anyone or it is a penalty crap.
I understand all of the history and rivalries stuff as well.
Another point would be that the strength of schedule would be virtually identical in a conference scenario since everyone plays the same teams(relatively depending on the non conference games)
12 is a good number, to me that isn't a topic, it should be about how we come to that 12. I don't dislike the way it is now, just mulling over what I think I'd like if it did change.