Then hire an attorney and have a Will written and that won't happen. It's not the job of the State to babysit people who are too lazy to take basic legal precautions.
That said, I still don't agree with the elimination of marriage as a legal relationship, for a variety of reasons.
Consenting adults should be free to register their wishes with the relevant Courts using Wills, Powers of Attorney, and Contracts as they see fit.
The State, however, should have no voice in approving or disapproving those relationships. It's quite frankly none of their business.
L
I disagree. "The State" is merely a construction of society, and a well-ordered society is built by family units, not individuals. Society is actually an organic growth of extended family units. Allowing marriage special legal privileges is a way of incentivize marriage, and thus create stable families, providing order to society. Where marriage has deteriorated most precipitously - inner cities - order has broken down as well. This obviously has a negative effect on society at large, and thus, to prevent this, we get back to society, through its construct of "The State," encouraging marriage.