This is all about negotiations. In negotiations with ESPN the B1G wants more leverage. They will either get ESPN to overpay them some figure that is ridliciously high or the B1G will send its TV rights in 2016 to its BTN partner FOX.
Fox Sports 1 only has the Big East Basketball, half of the Big XII football and zero Big XII basketball, half of the Pac-12 football and basketball.
ESPN has the SEC football(except tier 1 games on CBS), half of the Big XII football, and all of Big XII basketball, half of the Pac-12 football and basketball, and ALL of the ACC.
The B1G rights are up in 2016 and its obvious that the B1G will at best for ESPN be split with FOX. Fox currently has the B1G football title game, and withtthe BTN/FOX relationship I would bet atleast a half of the B1G rights will be on FOX. I think ESPN now realizes this and will have the SEC, ACC, Big XII, Pac-12 while FOX will have B1G, Big XII football, Pac-12, Big East basketball.
I would prefer ESPN to FS1 all day long. FS1 tries so hard to be cool its sucks.