I think:Agreed. It's too simple to just kill off every character. Also, Jimmy probably wouldn't have continued the Saul Goodman life if it was even partially responsible for Kim's death.
Kim leaves, uses the cleaning service or whatever, and Jimmy remains as Saul in Albuquerque to essentially protect her as he can keep an eye on Hector and other baddies that may wish to harm her. She either leaves for her safety or over guilt for what happened to Howard.
It's either that or they do a big retcon of Saul's circumstances throughout the events of Breaking Bad, ie: Kim still lives with Jimmy in New Mexico but we just don't see her as she's not relevant to Walter's story. I do think she leaves though. I think the resolution to the Jimmy story, pre-Breaking Bad and the resolution to Gene's story are intertwined.
It's either that or they do a big retcon of Saul's circumstances throughout the events of Breaking Bad, ie: Kim still lives with Jimmy in New Mexico but we just don't see her as she's not relevant to Walter's story. I do think she leaves though. I think the resolution to the Jimmy story, pre-Breaking Bad and the resolution to Gene's story are intertwined.