Those are excellent points. But, traditionally, competition drives prices down.
How is it competition? Will we have a choice, Fox Sports 1 or ESPN? No, we will be forced to take both. That is not competition. The only way there would be competition is if both had rights to the same programming, and Dish got to choose who provided it. Yes, competition drives prices down, but only if they
actually compete i.e. offer a similar product that can be purchased from two or more sources that have to compete for business.
What I describe is another economic principle: supply and demand. Another sports network will mean more demand for the limited supply of sports programming, especially the valuable ones like the NFL, NBA, MLB, NCAA, NHL, Olympics, NASCAR, FIFA, and so on.
So let's say MNF rights come back up, and ESPN and Fox get into a bidding war, pushing the price up 50% or more. It's not like the loser can just put on the CFL. No, the winner will raise it's prices more than it would on its own. I see it no other way that this could cause prices to go down.