Kal Ho Naa Ho

Here is the hero, who talks of having all kinds of fun today, since his concept is "Kal Ho Naa Ho". And yet in the end, asks the supporting hero to just have/wed his lady love only in this janam, since he wants her to be his wife/everything in all the janams to come. To me, this concept is totally baseless and doesnt gel with the whole film. Taking the film back to the ages. And what about the supporting hero and the lady love, dont they have any say during the next janams. Common lets bring some sense into the movies please.