Well, didn't Slingbox originally work from point to point with encryption without the using any servers in-between? That's how I remember it. If, so, Dish should just have the boxes revert to that. Perhaps the most recent boxes made under Echostar may not be capable of this due to hardware. I don't know. Of course, after Dish/Echostar acquired Slingbox, they needed servers to inject ads. That was the purpose of the servers, not as a function to stream from Slingbox to playback device.
Also, I remember that Skype used to run end to end encryption WITHOUT any servers between the two points. However, after Microsoft acquired Skype, MS changed it and routed all streams to their servers and then out to the other point. This created some problems at first (and still can) and could allow for MS to "snoop" on the streams. Skype lost its end to end, nothing in between streaming communication. BTW, the best privacy texting apps also work this way with NO servers in-between.
I personally believe that servers are not necessary in the case of even the latest Slingboxes. However, it may cost money to alter the code to allow for point to point with no server in-between, and that is likley money Dish does not want to spend. Dish does simply not care.
The problem is that Slingbox works FAR MORE RELIABLY than Dish Anywhere EVER HAS. Since the latest major updates to Dish Anywhere, I have ALWAYS had to fall back to Slingbox because DA was a MESS. I appreciate that DA has been getting better, but the idea that I will have to depend upon ONLY DA is pretty depressing when it comes to watching TV remotely.
In addition TiVo's remote viewing experience is still a MESS (even worse than DA?) of its own, and Slingbox was far too often the ONLY solution to watch TiVo remotely. Of course, I could be dead by 2022, and that would be easier than dealing with a flaky DA or TiVo App experience.