With so many Marriages Failing, a possible Solution would?

Don’t ask us knuckleheads. You need advice from a professional and or someone that loves you. 

there is such a document. it is called prenuptial agreement. i have one. there is also a document about what happens if one dies. it is called a testament. i mean duh

I'm a big fan of prenuptial agreements to protect premarital assets. But instead of planning for divorce it would be better to just make one of the demands for buying a marriage license proof that you've spent a year in premarital counseling. The goal shouldn't be to make divorce easier but to make divorce less likely. Divorces by definition destroy children. You seem to be overly concerned about avoiding a nasty court case. Meaning you're nowhere near mature enough to be considering marriage anyway. 

I agree with the sentiments.  The more you consider the possibilities the less likely it is that you will need to worry about it.  The more that you have considered what MIGHT go wrong during the marriage the better defended you both are to prevent it going wrong in the first place.

That's called a prenup. But some can be invalidated if they are in disagreement with community property laws, and/or if they are very obviously unfair toward one partner.

There is such a document.  It's called a "prenup."

Two people cannot decide custody.  There must be Court approval.

I have NO idea what "added with the marriage certificate" means.  Do you understand the legal system at all?

there is already a solution...its called birth control

I fail to see how writing out the divorce document ahead of time would be a "solution" to failing marriages, and since circumstances change over time (as well as divorce laws varying from place to place, and lots of couples move around) it wouldn't really be of any benefit to have a pre-prepared divorce document. Let's say they decide the kids will live with mom in the event of a divorce, but mom develops a bad drinking problem during the marriage (so may not be a suitable primary custodian anymore). As for deciding on asset split, couples can do that at the time of divorce OR the court will do it for them. It's pretty hard, and not practical, to write up a document dividing assets that don't yet exist. 

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SOME couples do write up pre-nuptial agreements before marriage, but those typically are due to one or both parties having substantial assets going into the marriage. Couples who have few or no assets haven't the same reasons for a pre-nup.

Do you think that people don't learn anything about one another or change during the course of a lengthy relationship?

Because "Wife gets the kids" may have seemed like an excellent idea until wife develops a drinking problem in year five of the marriage.  "Equal split of assets" may be great when you're twenty-two and broke, but ask any billionaire couple exactly how much of his stock daddy is willing to give up in order to remarry his pregnant secretary.

That is traditionally called a Pre-nup and people have beat you to it with that idea.