Think about the power dynamic during this time in the story. Not only have the Jedi been deemed traitors to the government but they were summarily executed. Since they had no virtually no allies to defend them or clear their names and at least during ROTS there was no Rebellion, what choice did Obi-Wan or Yoda really have? Either they fight, outnumbered and risk having Luke or Leia murdered, or they go into hiding and protect the whereabouts/ known existence of the Chosen One's children a secret in the slim hope that they might rise up one day to restore order to the galaxy. This makes Obi-Wan and Yoda's exile selfless, rather than selfish because they weren't just going off to sulk like cowards.
As a character arc, it speaks to Obi-Wan's nobility that he recognized his fault in training Anakin and spent the rest of his life protecting the children that would one day make things right. Luke Skywalker is Obi-Wan's redemption, which means protecting him is the key to everything being made right. So in essense not only is Anakin redeemed by the end of ROTJ, but Luke succeeds in stopping Vader, something that Obi-Wan was unable to do and ultimately means that Obi-Wan's sacrifice to protect and train Luke was not in vain. Not only that but Luke exceeded his mentors by taking a path that neither Obi-Wan nor Yoda could forsee and instead of killing his father, helped turn Anakin back to the light by believing that Anakin maintained a spark of his humanity.
In this way each of the Jedi maintains their nobility. They're all flawed but ultimately prove their worth by the choices they make and isn't the good vs. evil story of Star Wars more about the choices the characters make rather than their inherent temperament? This is why the narrative is more rich than people tend to give it credit for. It may deal with those timeless themes of morality but the narrative challenges the characters in ways that speaks to their flawed humanity because their choices are what define them rather than where they come from.
To this end I think the possibility of all this meaning is potentially undermined by the slightest deviation from the existing material. So if the writers move to change these things I think they should tread very carefully.