Friendship and Love

Lets look at a particular synergy between these two relationships, the fuzzy area where they overlap. Something in the screenplay of the recent movie Kabhi Alvida... seeded this thought in my mind. There is this one scene, just before Rani's marriage to Abhishek where she and Shahrukh are sitting on a bench (please ignore the fact that its her marriage and all her family doesn't care leaving her alone :)) talk about love and friendship. In a nutshell the question was do you need love in a relationship or is friendship enough? Is friendship a form of love as well? For Rani, the reason for not loving Abhishek was the fact that the relationship was so full of friendship that there was no place for any love at all. Obviously this was just a crutch to support her handicapped view of her self-imposed marriage.
But this brings the more important question into light - can friendship make up for the lack of love? Can you be best friends with someone and not love them? And still be ready to spend your life with them? Or is friendship transitioning to love, a more natural path? And if that is the natural path, does love replace the camarderie that friendship had brought in?
A lot of questions, I do not claim to have answers in black and white to all or even some of them, in fact I know for sure that even my answers will be different at different times, in different moods, in different situations. Even the order in which you talk about these two things can imply a lot; when I started writing I had the title as Love and Friendship but then changed it to the current one, and if you ponder awhile you will notice how big a difference even that makes!