I was just talking with someone about this yesterday. They told Obi Wan to take Luke and Lea to Tattooine and learn more about the Jedi way from Qui Gon. They have developed a way for him to communicate with dead Jedis.
This concept actually makes the Jedi live on forever. Also, you'll remember in Episode IV(?) when an older Obi Wan lets Darth Vader kill him. Same concept. He is old and fragile and will be of greater use to the Jedi in death. He can teach the Jedi ways even when he's dead.
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