I don't think it'll happen. The ariticle cited the success of the YES Network. To this date, YES isn't on Dish Network and YES and various NYC cable companies were locked in a heated battle over distribution when the network launched, similar to Big Ten Network.
I can see someday though, the Cubs will vanish all together from WGN. The number of games aired on WGN have been dwindling every year. Don't think it could happen...who would've thunk that the Braves would vanish from TBS?