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Here's my take. Quentin kills Jenny, angry Magda curses him, blah-blah-blah. Beth does all she can to help Quentin (being the only one to know that he's a wolf, in more ways than one), and it starts working on her mind. She hopes Quentin will still want to be with her, but he won't, seeing as he considers that he has no future. Beth is upset, and in her now-whacko state of mind thinks that Quentin has it for another woman. She plans on committing suicide. That's when Jamison finds out how upset she is and she tells him that Quentin wants another woman, not her. Jamison confronts Quentin, but Quentin can't tell him the truth, so Jamison states that he hates him forever (which will cause Quentin's ghost to search for "Jamison", longing for his forgiveness). Beth, now totally snapped, first shoots Quentin with a silver bullet in his room and then does herself in. To avoid a scandal over what they think was a lover's spat, Judith and Edward have the room sealed up and make the excuse that Quentin went away to Europe.
Now, what about Lara? Well, she does return to get Jamison and Nora, but Quentin, with his knowledge of the occult, managed to stop her before she went up in flames (he gets Evan to give him a hand). Since Barnabas had not traveled back in time, all the other peripheral stuff regarding this subplot didn't happen.
How's about Rachel? She is forced to go back to Trask's lovely academy, but when all that business with Judith came to a head (when she threatens him with exposure, he commits suicide), she and Tim Shaw go off to start a new life.
Judith has the west wing completely closed off to make sure Quentin's room is never discovered. She dies in 1912, Edward in 1914. Jamison marries the following year (Nora never marries and remains living at Collinwood until she passes away during the 1930's). In 1917, Elizabeth is born.
Carl moves to New York City where he puts his fascination with dance-hall girls (Pansy Faye left him just as quickly as she entered his life) into a fascination with vaudeville and invests what little money he receives from his sister in the stage and later in film. However, during the Depression, his investments crash. The stress proves too much, and he dies in an alcohol-related car crash in Los Angeles (where he had relocated). Sadly, he had never married, love always alluding him.
The End.
Gerard