It would be cool to have ownership and team name changes tracked as part of team history. This could also be reflected in the record book and trade history.
Resurrecting this wish as I think it’d be nice to see team leadership changes. Teams currently show ‘established’ year, but if you inherit the team, it doesn’t mean much. Even simply seeing the mm/dd/yyyy ranges for a given team’s various owners would be nice.
Clicking on the manager’s name tells you when he took over the team, but that’s really minimal when it comes to what would be great to see as @Henry.Woodbury described.