I'd actually forgotten about the legal side to marriage, I was only thinking on a "love" level.
You are indeed right, the law should make the playing field level whereby a partner is entitled to the same amount of respect and financial gain as a married person. Same sex partnerships should also be under the same fair rules, after all a relationship is a relationship in which ever colour it's painted.
This being said......if that law where to be changed then marriage probably would die out, or at least numbers would go down dramatically, it would purely be for the true romantics surely?