The contract is forever though. That was the condition of Washington getting the team.
I also remember that Angelos' control was for all time. His percentage of ownership was some ridiculous number in the beginning, but little by little he would cede a small percentage to the Lerners/Nats until the Nats reached 33% of ownership and then that was the maximum amount the Nats could get.
So if the Nats could not break away from MASN, I always thought the best route forward would force Angelos somehow to sell his shares of MASN to the Lerners/Nats.
Bankrupt MASN, bankrupt the Orioles, force him or get him to sell enough controlling shares to the Nats so that the Nats have control. And then decide whether you want to revive a dead, lifeless entity in MASN or just dissolve it and create your own.