I'm not sure friendship will necessarily grow into passion. I think that kind of attraction is a different type of thing.
It takes BOTH passion and friendship to make it in a marriage. After years of living together, seeing each other "not at your best," attraction can fade, but friendship & loyalty can pull you through. On the other hand, sometimes situations arise that make you not "like" each other very much. In this case, the sexual bond can keep you together.
But, those solutions only work short-term. Overall in a marriage, you need BOTH.
From my POV, also, it helps when the spouses are not only accountable to themselves & each other, but also accountable to God. When one might not feel like giving anything to his/her spouse, he/she should recognize that it pleases God to give to the spouse. Of course, not everyone believes in God, but it can help a marriage.