Actually, Disney really wanted to keep the RSN's, you are correct that they were forced to sell as a condition of the purchase of 20th Century Fox.
If Disney was able to keep them, things might be a little different, they could still be on Dish, Disney still has a lot of power in the pay TV world, look at the money they get for ESPN, a channel I might watch once or twice a year.
Sorry, I must disagree. Disney was in the position having to sell the RSN's, and so, like any good home owner trying to sell house of horrors, will gladly make statements and moves that indicate that the entity for sale is worth more than it really is for the best possible price. To my recollection, there were reported a number of Fox holdings and real-estate that Disney did NOT want as part of the purchase of most of Fox. Among them were the 20th Century lot in Century City (that sits GREATLY unused compared to the beehive of activity on that lot before the sale to Disney) and for which Disney pays Fox to lease back, and other former Fox holdings that include the RSN's. Disney is a shrewd company, better managed under Iger who agreed to the purchase of junk among jewels, than the current brute in charge.
One must also consider that the equally shrewd Fox under Rupert Murdoch, would not agree to any deal unless Disney took off Murdoch's hands the assets that were now more junk than the diamond vault of content. Murdoch gladly bid "so long" to the troublesome RSN's. Rupert Murdoch kept all the real money makers for Fox such as his local stations group, Fox News, FS1 and FS2, etc. On that fact alone, one has to consider the savvy of Fox requiring the RSN's also be bought by Disney: the RSN's were not worth Fox keeping and found someone upon whom to unload it; RSN's aren't what they used to be.
Fox was in the
"cat birds' seat" on this deal--NOT Disney. But it was worth every penny for Disney to buy the Fox junk, such as the useless and now barely populated Fox Studios lot for which Disney pays Fox a lease-back, that would net Disney the Fox voluminous library of films and TV series to provide much needed additional "mature" content for its Disney+ as well as Fox's stake in Hulu (giving Disney majority control of Hulu) that gives Disney an additional streaming service that Disney can leverage, with its now significant amount of content outside of Disney+. Fox was clearly transitioning to a slimmer broadcast and linear TV company, while Disney was going deep into becoming more of a streaming content player with gobs of content to provide while holding on to its broadcast and linear TV channels.
IMHO, RSN's make NO SENSE to Disney's new path in viewable entertainment. Fox even lost some of the RSN's it once had. It was clear RSN's had seen its day and looking at the current problems the new RSN owners had and still have in getting the most money for its debt at purchase of RSN's, it sure looks like Rupert Murdoch and Bob Iger knew what they were doing in NOT keeping RSN's--in the case of Disney they choose ESPN's over RSN's in the choice the Justice Department gave Disney, but I don't think Disney every wanted the RSN's, anyway. All they really wanted was the vault of content and nothing else.