@BumbleBeeBoogie,
Seems like the bulk of the discussion revolves around stipulating the term "obsolete"...
I have been asking the same question which was led by "should same sex marriage be a part of the constitution?" Naturally one would have to define "marriage".
As the discussion here has made it clear, the definition, role, and nature of marriage is not the same as a century ago, which is a legal understanding of marriage.
Also mentioned in this discussion are its variance in value and purpose towards the notion of marriage, which is a personal understanding of marriage.
A discussion on the second topic, the personal understanding of marriage is very interesting, for we see people saying what they think of all positions (the lady who shared her experience from arranged marriage was very interesting to me), but as this discussion has proved, things can get quite controversial, shouting beliefs and ideas through experience and pseudo statistics and observations and assumptions. This goes nowhere, especially in this informal forum where credibility, argumentative structure, and "wiseness" of individual is ambiguous.
the legal understanding of marriage would be even more impossible since no one truly understands the nature and history of the constitution, its original purpose nor its current purpose and function.
seems like people here have been trying to "sound valid" by stating some random statistic or observation, but anyone who has exercised any appreciable level of critical thinking knows their comment is as thin as wax paper.
the bigger question that needs to be answered from the extension of your post is, so what?
it is clear that "marriage is becoming obsolete". you don't even need to explicitly articulate this fact. what is important is why. Why did we even have a marriage in the first place? why is it dissolving now? why is it still working for some? what is it about them that makes a marriage work, and about the other's who get divorced since they are both becoming married, same definition, same law, but some of us get divorced easily, some of us stay life long partners. What is it about us humans and our beliefs and behaviors that lead to these two outcome? From these we can perhaps extract the essence, reverse engineer, to a happy, successful, fulfilling marriage, rather than the forward process we have done where we first make a ideal "idea of marriage" then seeing the result of it exercised (which is 33% fail 33% success and 33% non-participant) =].
so rather than defending the notion of marriage, it would be more helpful to us all if everyone from here on out just list the things one have done or seen that works and doesn't work to be in a successful relationship/ partnership. and the accumulation of those actions and beliefs that are conducive to a successful marriage will be the new definition of "marriage". Since the constitution is an arbitrary, artificial, fabricated thing that humans made crudely based off of God and its ethics, we can easily change that if we can come up with a more rational, superior, insightful, well thought out rule to promote harmony and happiness.
yay xD