Dish will make a decision as to which ones to offer. A guess would be that they would match what Direct has done. Again the legislation misses the point - Sat providers should be allowed to offer multiple adjacent DMAs within the same spot beam. In reality, I do not think there is going to be a big push unless there is a monetary incentive for the sat company - like a two tiered pricing for locals - extra money for expanded locals.
A long time ago, Dish used to sell people as many network packages as they wanted.
It is the networks that prevent this from happening.
Since all political ads air on those channels, the broadcasters get whatever they want from Congress.