Aren't you automatically giving an advantage to all the teams with 9 home games? Every year the teams in divisions that have 9 home games will be statistically more likely to make the playoffs.
Not if every team in each conference has the same number of home games.
But i've read that the extra games will all be at neutral sites, so this would be a moot issue.
More interesting to me is what the new formula would be to determine the additional opponent. Obviously they won't want division rivals to play an unbalanced number of games or home games against one another. If they do go with a scheme where each team in one conference gets an extra home game, then the only reasonable way to schedule the extra games would be to make all of them inter-conference games.
Currently teams play their division opponents home-and-home, which surely won't change (6 games). Then they play every team in one division in the same conference (4 games), every team in one division in the other conference (4 games), then the teams that finished in the same rank in the other two divisions in the same conference (2 games).
I could see adding one more game vs. a team that finished in the same rank in one of the other divisions in the other conference? Or maybe they'll get creative, at the expense of objective fairness, and add a subjectively-selected "rivalry" game of interest?
...dave
Edit: Oops, a couple of the above points were already touched on by others, above! Good stuff.