The contract resets. It may be a liability for a few years, but then the payout will lower. If MLB ever has to buy back rights in order to either take them in house or sell the league as a block, the O's will get the Nats' portion and then will have years to pay it out or they will have an argument that they should get the Nats' revenue in perpetuity to then distribute back to the nats after taking overhead. It's a miserable deal for the Nats. I hope our new owner is more litigious because their only leverage is constant litigation and discovery that will embarrass the league enough that they do something
I don't even know how they'd pull the comparables to do a reset. We got the Dodgers at 300 million. Padres have no deal, but get a few million from MLB to get them by. Other teams have been given their RSN for free to run themselves. Yankees, Red Sox, and Phillies are still pulling in over 100 million. Half the teams are in bankruptcy negotations with their RSN. I'm sure the Os, Nats and MLB would all have incentive to come to an agreement that simplifies the agreement and gives them some certainty going forward.
When they drew up the deal, all the compensation to the O's was supposed to be an ownership stake in MASN with rights fees dwarfed by carriage fee revenues. They miscalculated the meteoric rise of other team's deals combined with the early peaking of the carriage fee model, so there is really is little value left in the current arrangement. It seemed Angelos saw value in being able to screw the Nats, but the new owners don't seem to care about that so far.
I'd imagine Manfred sees teams equally sharing an in-market streaming package amongst the teams that go in on it. There wouldn't really be much for the Nats and Os to fight over if it goes that way.