I have watched the movie many times in a row so I have analyzed thr movie to a T. I believe that if Jack didn't die that Rose and Jack would land in New York with nothing besides what they had on and get some jobs and begin living a simple life. I think that Rose and Jack's love was eternal and that even though Rose moved on and married someone else her heart still belonged to Jack. I think that when Rose would die and when she met her husband and Jack in heaven (if you believe in it) that when Rose's husband and Jack were there she would choose Jack and they would live together in harmony forever.