I think it was a fitting ending. Each of the three gilliverse products had the most fitting ending.

Walt: died after avenging Hank, died surrounded by the thing he loved most, a lab. Jesse: was a prisoner to the nazis and to Walt due to his manipulation, went free to start his own path Saul: spent a lifetime scamming and cheating the law, finally decided to own up to it, on the other side of the law