To try to be as open-minded as I can, I think it depends on your expectation of marriage. If you are only making a financial commitment or to enjoy someone as long as they make you happy, then I guess that kind of marriage doesn't need to last. But the kind of marriage where people want to invest their hearts and lives in each other, challenge themselves, fight together through good and bad, and keep returning to each other even when it gets hard, will both require and inspire eternal commitment. I think it's important for someone to figure out as honestly as possible what they really want from marriage. Speaking for myself, if I can't find someone I can do the latter with, I'd rather be single. I can't get or give or all I want unless it's that important to both of us.