Fox did this because Manfred recently talked about expansion and complete realignment. The league likes the idea of 32 teams and 8, 4 team divisions. They believe it will save significant dollars in travel and by realigning will make their product more marketable. They could even sell each division as individual television packages which if they did, they think will optimize their most valuable franchises and lead to more money and more televised games overall. For example, the Yankees, Mets, Phillies, Red Sox division would lead to a bidding war and a huge number, and by piecing it out that way you could basically ensure all of those games are aired. Same with the Dodgers division and to a lesser extent Cubs and Cardinals. It would allow more tv partners as well with better advertising and optimization to the local markets.