A couple of questions

I think the next boxing game should have a mode so that you can pick a time period to fight and do and only encounter a certain fighter during that time period.

If you chose the 20s then Dempsey is champ, etc. rather than just having all the fighters from different periods fighting in the same time period.
They should also have a madden like owner mode where you deal with promoters, etc.

More realism would do the games justice.